漂浮广告，兼容ie、firefox，多个漂浮不冲突，调用只需两行代码-陈桂林博客

将广告内容放在div中，设置一个id，然后用下面方法调用

var adcls=new AdMove("div的id");
 adcls.Run();

注意，在调用前要先引用Main.js和AdFloat.js,div也要在调用前写好，原因就不用说了吧

或者也可以用下面方法，在页面加载完成时调用，就不用考虑位置了

addEvent(window,"load",initad);
function initad(){
 var adcls=new AdMove("div的id");
 adcls.Run();
 }

还有两个方法一般情况下没什么用，有兴趣的可以试试，功能是设置漂浮的起始坐标和方向的，如果省掉的话是随机位置随机方向

adcls.SetLocation(x,y)
 adcls.SetDirection(dirx,diry)

漂浮广告的斜率是每次碰壁后随机改变的，这样就决不可能出现多个广告，起始位置和方向一致导致其中一个总是被挡住，虽然几率很小

第一版：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head><title>wahaha</title>
    <meta http-equiv="Content-Type" content="text/html;charset=gb2312" />
    <script type="text/javascript">
    <!--
//公共脚本文件 main.js
function addEvent(obj,evtType,func,cap){
    cap=cap||false;
    if(obj.addEventListener){
        obj.addEventListener(evtType,func,cap);
        return true;
    }else if(obj.attachEvent){
        if(cap){
            obj.setCapture();
            return true;
        }else{
            return obj.attachEvent("on" + evtType,func);
        }
    }else{
        return false;
    }
}
function getPageScroll(){
    var xScroll,yScroll;
                
    if (self.pageXOffset) {
        xScroll = self.pageXOffset;
    } else if (document.documentElement && document.documentElement.scrollLeft){
        xScroll = document.documentElement.scrollLeft;
    } else if (document.body) {
        xScroll = document.body.scrollLeft;
    }
                
    if (self.pageYOffset) {
        yScroll = self.pageYOffset;
    } else if (document.documentElement && document.documentElement.scrollTop){
        yScroll = document.documentElement.scrollTop;
    } else if (document.body) {
        yScroll = document.body.scrollTop;
    }
                
    arrayPageScroll = new Array(xScroll,yScroll);
    return arrayPageScroll;
}
function GetPageSize(){
    var xScroll, yScroll;
    if (window.innerHeight && window.scrollMaxY) {  
        xScroll = document.body.scrollWidth;
        yScroll = window.innerHeight + window.scrollMaxY;
    } else if (document.body.scrollHeight > document.body.offsetHeight){
        xScroll = document.body.scrollWidth;
        yScroll = document.body.scrollHeight;
    } else {
        xScroll = document.body.offsetWidth;
        yScroll = document.body.offsetHeight;
    }
    var windowWidth, windowHeight;
    if (self.innerHeight) {
        windowWidth = self.innerWidth;
        windowHeight = self.innerHeight;
    } else if (document.documentElement && document.documentElement.clientHeight) {
        windowWidth = document.documentElement.clientWidth;
        windowHeight = document.documentElement.clientHeight;
    } else if (document.body) {
        windowWidth = document.body.clientWidth;
        windowHeight = document.body.clientHeight;
    }   
    if(yScroll < windowHeight){
        pageHeight = windowHeight;
    } else { 
        pageHeight = yScroll;
    }
    if(xScroll < windowWidth){   
        pageWidth = windowWidth;
    } else {
        pageWidth = xScroll;
    }
    arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight) 
    return arrayPageSize;
}
                
                
                
//广告脚本文件 AdMove.js
                
/*
例子
<div id="Div2">
    ***** content ******
</div>
                
var ad=new AdMove("Div2");
ad.Run();
*/
                
////////////////////////////////////////////////////////
var AdMoveConfig=new Object();
AdMoveConfig.IsInitialized=false;
AdMoveConfig.ScrollX=0;
AdMoveConfig.ScrollY=0;
AdMoveConfig.MoveWidth=0;
AdMoveConfig.MoveHeight=0;
AdMoveConfig.Resize=function(){
    var winsize=GetPageSize();
    AdMoveConfig.MoveWidth=winsize[2];
    AdMoveConfig.MoveHeight=winsize[3];
    AdMoveConfig.Scroll();
}
AdMoveConfig.Scroll=function(){
    var winscroll=getPageScroll();
    AdMoveConfig.ScrollX=winscroll[0];
    AdMoveConfig.ScrollY=winscroll[1];
}
addEvent(window,"resize",AdMoveConfig.Resize);
addEvent(window,"scroll",AdMoveConfig.Scroll);
function AdMove(id){
    if(!AdMoveConfig.IsInitialized){
        AdMoveConfig.Resize();
        AdMoveConfig.IsInitialized=true;
    }
    var obj=document.getElementById(id);
    obj.style.position="absolute";
    var W=AdMoveConfig.MoveWidth-obj.offsetWidth;
    var H=AdMoveConfig.MoveHeight-obj.offsetHeight;
    var x = W*Math.random(),y = H*Math.random();
    var rad=(Math.random()+1)*Math.PI/6;
    var kx=Math.sin(rad),ky=Math.cos(rad);
    var dirx = (Math.random()<0.5?1:-1), diry = (Math.random()<0.5?1:-1);
    var step = 1;
    var interval;
    this.SetLocation=function(vx,vy){x=vx;y=vy;}
    this.SetDirection=function(vx,vy){dirx=vx;diry=vy;}
    obj.CustomMethod=function(){
        obj.style.left = (x + AdMoveConfig.ScrollX) + "px";
        obj.style.top = (y + AdMoveConfig.ScrollY) + "px";
        rad=(Math.random()+1)*Math.PI/6;
        W=AdMoveConfig.MoveWidth-obj.offsetWidth;
        H=AdMoveConfig.MoveHeight-obj.offsetHeight;
        x = x + step*kx*dirx;
        if (x < 0){dirx = 1;x = 0;kx=Math.sin(rad);ky=Math.cos(rad);} 
        if (x > W){dirx = -1;x = W;kx=Math.sin(rad);ky=Math.cos(rad);}
        y = y + step*ky*diry;
        if (y < 0){diry = 1;y = 0;kx=Math.sin(rad);ky=Math.cos(rad);} 
        if (y > H){diry = -1;y = H;kx=Math.sin(rad);ky=Math.cos(rad);}
    }
    this.Run=function(){
        var delay = 10;
        interval=setInterval(obj.CustomMethod,delay);
        obj.onmouseover=function(){clearInterval(interval);}
        obj.onmouseout=function(){interval=setInterval(obj.CustomMethod, delay);}
    }
}
                
    //-->
    </script>
</head>
<body>
    <div id="gg1" style="width:100px;height:100px;background-color:red;color:yellow">
        广告1
    </div>
    <div id="gg2" style="width:100px;height:100px;background-color:blue;color:yellow">
        广告2
    </div>
    <div id="gg3" style="width:100px;height:100px;background-color:green;color:yellow">
        广告3
    </div>
    <script type="text/javascript">
    <!--
        var ad1=new AdMove("gg1");
        ad1.Run();
    var ad2=new AdMove("gg2");
        ad2.Run();
    var ad3=new AdMove("gg3");
        ad3.Run();
    //-->
    </script>
</body>
</html>

第二版：

增加了关闭按钮，个人觉得按钮做得比较丑，不过还算实现了，我在ie7和firefox2.0.0.14最高版本做了测试

调用增加了一个参数（可以省略）,设为true就添加关闭按钮在右上角

var ad3=new AdMove("gg3",true);
 ad3.Run();

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head><title>wahaha</title>
    <meta http-equiv="Content-Type" content="text/html;charset=gb2312" />
    <script type="text/javascript">
    <!--
    //公共脚本文件 main.js
    function addEvent(obj,evtType,func,cap){
        cap=cap||false;
        if(obj.addEventListener){
            obj.addEventListener(evtType,func,cap);
            return true;
        }else if(obj.attachEvent){
            if(cap){
                obj.setCapture();
                return true;
            }else{
                return obj.attachEvent("on" + evtType,func);
            }
        }else{
            return false;
        }
    }
    function removeEvent(obj,evtType,func,cap){
        cap=cap||false;
        if(obj.removeEventListener){
            obj.removeEventListener(evtType,func,cap);
            return true;
        }else if(obj.detachEvent){
            if(cap){
                obj.releaseCapture();
                return true;
            }else{
                return obj.detachEvent("on" + evtType,func);
            }
        }else{
            return false;
        }
    }
    function getPageScroll(){
        var xScroll,yScroll;
        if (self.pageXOffset) {
            xScroll = self.pageXOffset;
        } else if (document.documentElement && document.documentElement.scrollLeft){
            xScroll = document.documentElement.scrollLeft;
        } else if (document.body) {
            xScroll = document.body.scrollLeft;
        }
        if (self.pageYOffset) {
            yScroll = self.pageYOffset;
        } else if (document.documentElement && document.documentElement.scrollTop){
            yScroll = document.documentElement.scrollTop;
        } else if (document.body) {
            yScroll = document.body.scrollTop;
        }
        arrayPageScroll = new Array(xScroll,yScroll);
        return arrayPageScroll;
    }
    function GetPageSize(){
        var xScroll, yScroll;
        if (window.innerHeight && window.scrollMaxY) {  
            xScroll = document.body.scrollWidth;
            yScroll = window.innerHeight + window.scrollMaxY;
        } else if (document.body.scrollHeight > document.body.offsetHeight){
            xScroll = document.body.scrollWidth;
            yScroll = document.body.scrollHeight;
        } else {
            xScroll = document.body.offsetWidth;
            yScroll = document.body.offsetHeight;
        }
        var windowWidth, windowHeight;
        if (self.innerHeight) {
            windowWidth = self.innerWidth;
            windowHeight = self.innerHeight;
        } else if (document.documentElement && document.documentElement.clientHeight) {
            windowWidth = document.documentElement.clientWidth;
            windowHeight = document.documentElement.clientHeight;
        } else if (document.body) {
            windowWidth = document.body.clientWidth;
            windowHeight = document.body.clientHeight;
        }   
        if(yScroll < windowHeight){
            pageHeight = windowHeight;
        } else { 
            pageHeight = yScroll;
        }
        if(xScroll < windowWidth){   
            pageWidth = windowWidth;
        } else {
            pageWidth = xScroll;
        }
        arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight) 
        return arrayPageSize;
    }
    //广告脚本文件 AdMove.js
    /*
    例子
    <div id="Div2">
        ***** content ******
    </div>
    var ad=new AdMove("Div2");
    ad.Run();
    */
    ////////////////////////////////////////////////////////
    var AdMoveConfig=new Object();
    AdMoveConfig.IsInitialized=false;
    AdMoveConfig.AdCount=0;
    AdMoveConfig.ScrollX=0;
    AdMoveConfig.ScrollY=0;
    AdMoveConfig.MoveWidth=0;
    AdMoveConfig.MoveHeight=0;
    AdMoveConfig.Resize=function(){
        var winsize=GetPageSize();
        AdMoveConfig.MoveWidth=winsize[2];
        AdMoveConfig.MoveHeight=winsize[3];
        AdMoveConfig.Scroll();
    }
    AdMoveConfig.Scroll=function(){
        var winscroll=getPageScroll();
        AdMoveConfig.ScrollX=winscroll[0];
        AdMoveConfig.ScrollY=winscroll[1];
    }
    addEvent(window,"resize",AdMoveConfig.Resize);
    addEvent(window,"scroll",AdMoveConfig.Scroll);
    function AdMove(id,addCloseButton){
        if(!AdMoveConfig.IsInitialized){
            AdMoveConfig.Resize();
            AdMoveConfig.IsInitialized=true;
        }
        AdMoveConfig.AdCount++;
        var obj=document.getElementById(id);
        obj.style.position="absolute";
        var W=AdMoveConfig.MoveWidth-obj.offsetWidth;
        var H=AdMoveConfig.MoveHeight-obj.offsetHeight;
        var x = W*Math.random(),y = H*Math.random();
        var rad=(Math.random()+1)*Math.PI/6;
        var kx=Math.sin(rad),ky=Math.cos(rad);
        var dirx = (Math.random()<0.5?1:-1), diry = (Math.random()<0.5?1:-1);
        var step = 1;
        var interval;
        if(addCloseButton){
            var closebtn=document.createElement("div");
            obj.appendChild(closebtn);
            closebtn.style.position="absolute";
            closebtn.style.top="1px";
            closebtn.style.left=(obj.offsetWidth-28) + "px";
            closebtn.style.width="24px";
            closebtn.style.height="12px";
            closebtn.style.borderStyle="solid";
            closebtn.style.borderWidth="1px";
            closebtn.style.borderColor="#000";
            closebtn.style.backgroundColor="#fff";
            closebtn.style.fontSize="12px";
            closebtn.style.color="#000";
            closebtn.style.cursor="pointer";
            closebtn.innerHTML="关闭";
            closebtn.onclick=function(){
                obj.style.display="none";
                clearInterval(interval);
                closebtn.onclick=null;
                obj.onmouseover=null;
                obj.onmouseout=null;
                obj.MoveHandler=null;
                AdMoveConfig.AdCount--;
                if(AdMoveConfig.AdCount<=0){
                    removeEvent(window,"resize",AdMoveConfig.Resize);
                    removeEvent(window,"scroll",AdMoveConfig.Scroll);
                    AdMoveConfig.Resize=null;
                    AdMoveConfig.Scroll=null;
                    AdMoveConfig=null;
                }
            }
        }
        obj.MoveHandler=function(){
            obj.style.left = (x + AdMoveConfig.ScrollX) + "px";
            obj.style.top = (y + AdMoveConfig.ScrollY) + "px";
            rad=(Math.random()+1)*Math.PI/6;
            W=AdMoveConfig.MoveWidth-obj.offsetWidth;
            H=AdMoveConfig.MoveHeight-obj.offsetHeight;
            x = x + step*kx*dirx;
            if (x < 0){dirx = 1;x = 0;kx=Math.sin(rad);ky=Math.cos(rad);} 
            if (x > W){dirx = -1;x = W;kx=Math.sin(rad);ky=Math.cos(rad);}
            y = y + step*ky*diry;
            if (y < 0){diry = 1;y = 0;kx=Math.sin(rad);ky=Math.cos(rad);} 
            if (y > H){diry = -1;y = H;kx=Math.sin(rad);ky=Math.cos(rad);}
        }
        this.SetLocation=function(vx,vy){x=vx;y=vy;}
        this.SetDirection=function(vx,vy){dirx=vx;diry=vy;}
        this.Run=function(){
            var delay = 10;
            interval=setInterval(obj.MoveHandler,delay);
            obj.onmouseover=function(){clearInterval(interval);}
            obj.onmouseout=function(){interval=setInterval(obj.MoveHandler, delay);}
        }
    }
    //-->
    </script>
</head>
<body>
    <div id="gg1" style="width:100px;height:100px;background-color:red;color:yellow">
        广告1
    </div>
    <div id="gg2" style="width:100px;height:100px;background-color:blue;color:yellow">
        广告2
    </div>
    <div id="gg3" style="width:100px;height:100px;background-color:green;color:yellow">
        广告3
    </div>
    <script type="text/javascript">
    <!--
        var ad1=new AdMove("gg1",true);
        ad1.Run();
        var ad2=new AdMove("gg2",true);
        ad2.Run();
        var ad3=new AdMove("gg3",true);
        ad3.Run();
    //-->
    </script>
</body>
</html>

第三版：

增加了移动按钮

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head><title>wahaha</title>
    <meta http-equiv="Content-Type" content="text/html;charset=gb2312" />
    <script type="text/javascript">
    <!--
    //公共脚本文件 main.js
    function addEvent(obj,evtType,func,cap){
        cap=cap||false;
        if(obj.addEventListener){
            obj.addEventListener(evtType,func,cap);
            return true;
        }else if(cap){
            if(document.all){
                obj.setCapture();
            }else{
                document.captureEvents(Event.MOUSEMOVE);
            }
            return true;
        }else if(obj.attachEvent){
            return obj.attachEvent("on" + evtType,func);
        }else{
            return false;
        }
    }
    function removeEvent(obj,evtType,func,cap){
        cap=cap||false;
        if(obj.removeEventListener){
            obj.removeEventListener(evtType,func,cap);
            return true;
        }else if(cap){
            if(document.all){
                obj.releaseCapture();
            }else{
                document.releaseEvents(obj.MOUSEMOVE);
            }
            return true;
        }else if(obj.detachEvent){
            return obj.detachEvent("on" + evtType,func);
        }else{
            return false;
        }
    }
    function getPageScroll(){
        var xScroll,yScroll;
        if (self.pageXOffset) {
            xScroll = self.pageXOffset;
        } else if (document.documentElement && document.documentElement.scrollLeft){
            xScroll = document.documentElement.scrollLeft;
        } else if (document.body) {
            xScroll = document.body.scrollLeft;
        }
        if (self.pageYOffset) {
            yScroll = self.pageYOffset;
        } else if (document.documentElement && document.documentElement.scrollTop){
            yScroll = document.documentElement.scrollTop;
        } else if (document.body) {
            yScroll = document.body.scrollTop;
        }
        arrayPageScroll = new Array(xScroll,yScroll);
        return arrayPageScroll;
    }
    function GetPageSize(){
        var xScroll, yScroll;
        if (window.innerHeight && window.scrollMaxY) {  
            xScroll = document.body.scrollWidth;
            yScroll = window.innerHeight + window.scrollMaxY;
        } else if (document.body.scrollHeight > document.body.offsetHeight){
            xScroll = document.body.scrollWidth;
            yScroll = document.body.scrollHeight;
        } else {
            xScroll = document.body.offsetWidth;
            yScroll = document.body.offsetHeight;
        }
        var windowWidth, windowHeight;
        if (self.innerHeight) {
            windowWidth = self.innerWidth;
            windowHeight = self.innerHeight;
        } else if (document.documentElement && document.documentElement.clientHeight) {
            windowWidth = document.documentElement.clientWidth;
            windowHeight = document.documentElement.clientHeight;
        } else if (document.body) {
            windowWidth = document.body.clientWidth;
            windowHeight = document.body.clientHeight;
        }   
        if(yScroll < windowHeight){
            pageHeight = windowHeight;
        } else { 
            pageHeight = yScroll;
        }
        if(xScroll < windowWidth){   
            pageWidth = windowWidth;
        } else {
            pageWidth = xScroll;
        }
        arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight) 
        return arrayPageSize;
    }
    //广告脚本文件 AdMove.js
    /*
    例子
    <div id="Div2">
        ***** content ******
    </div>
    var ad=new AdMove("Div2");
    ad.Run();
    */
    ////////////////////////////////////////////////////////
    var AdMoveConfig=new Object();
    AdMoveConfig.IsInitialized=false;
    AdMoveConfig.AdCount=0;
    AdMoveConfig.ScrollX=0;
    AdMoveConfig.ScrollY=0;
    AdMoveConfig.MoveWidth=0;
    AdMoveConfig.MoveHeight=0;
    AdMoveConfig.Resize=function(){
        var winsize=GetPageSize();
        AdMoveConfig.MoveWidth=winsize[2];
        AdMoveConfig.MoveHeight=winsize[3];
        AdMoveConfig.Scroll();
    }
    AdMoveConfig.Scroll=function(){
        var winscroll=getPageScroll();
        AdMoveConfig.ScrollX=winscroll[0];
        AdMoveConfig.ScrollY=winscroll[1];
    }
    addEvent(window,"resize",AdMoveConfig.Resize);
    addEvent(window,"scroll",AdMoveConfig.Scroll);
    function AdMove(id,addCloseButton){
        if(!AdMoveConfig.IsInitialized){
            AdMoveConfig.Resize();
            AdMoveConfig.IsInitialized=true;
        }
        AdMoveConfig.AdCount++;
        var obj=document.getElementById(id);
        obj.style.position="absolute";
        var W=AdMoveConfig.MoveWidth-obj.offsetWidth;
        var H=AdMoveConfig.MoveHeight-obj.offsetHeight;
        var x = W*Math.random(),y = H*Math.random();
        var rad=(Math.random()+1)*Math.PI/6;
        var kx=Math.sin(rad),ky=Math.cos(rad);
        var dirx = (Math.random()<0.5?1:-1), diry = (Math.random()<0.5?1:-1);
        var step = 1;
        var interval;
        if(addCloseButton){
            var closebtn=document.createElement("div");
            obj.appendChild(closebtn);
            closebtn.style.position="absolute";
            closebtn.style.top="1px";
            closebtn.style.left=(obj.offsetWidth-28) + "px";
            closebtn.style.width="24px";
            closebtn.style.height="12px";
            closebtn.style.borderStyle="solid";
            closebtn.style.borderWidth="1px";
            closebtn.style.borderColor="#000";
            closebtn.style.backgroundColor="#fff";
            closebtn.style.fontSize="12px";
            closebtn.style.color="#000";
            closebtn.style.cursor="pointer";
            closebtn.innerHTML="关闭";
            closebtn.onclick=function(){
                clearInterval(interval);
                closebtn.onclick=null;
                obj.onmouseover=null;
                obj.onmouseout=null;
                obj.MoveHandler=null;
                AdMoveConfig.AdCount--;
                if(AdMoveConfig.AdCount<=0){
                    removeEvent(window,"resize",AdMoveConfig.Resize);
                    removeEvent(window,"scroll",AdMoveConfig.Scroll);
                    AdMoveConfig.Resize=null;
                    AdMoveConfig.Scroll=null;
                    AdMoveConfig=null;
                }
                obj.removeChild(closebtn);
                obj.style.overflow="hidden";
                setTimeout(function(){CloseIt(obj);},0);
            }
            var movebtn=document.createElement("div");
            obj.appendChild(movebtn);
            movebtn.style.position="absolute";
            movebtn.style.top="1px";
            movebtn.style.left=(obj.offsetWidth-56) + "px";
            movebtn.style.width="24px";
            movebtn.style.height="12px";
            movebtn.style.borderStyle="solid";
            movebtn.style.borderWidth="1px";
            movebtn.style.borderColor="#000";
            movebtn.style.backgroundColor="#fff";
            movebtn.style.fontSize="12px";
            movebtn.style.color="#000";
            movebtn.style.cursor="pointer";
            movebtn.innerHTML="移动";
            function BoxMouseMove(e){
                if(movebtn.moveflag){
                    var mx,my;
                    if(e){
                        mx=e.pageX;
                        my=e.pageY;
                    }else{
                        mx=event.x;
                        my=event.y;
                    }
                    x=mx-movebtn.lastleft;
                    y=my-movebtn.lasttop;
                    movebtn.parentNode.style.left = x + "px";
                    movebtn.parentNode.style.top = y + "px";
                }
            }
            movebtn.onmousemove=function(e){
                BoxMouseMove(e);
            }
            movebtn.onmousedown=function(e){
                var mx,my;
                if(e){
                    mx=e.pageX;
                    my=e.pageY;
                }else{
                    mx=event.x;
                    my=event.y;
                }
                addEvent(movebtn,"mousemove",BoxMouseMove,true);
                movebtn.lastleft=mx-parseInt(movebtn.parentNode.offsetLeft);
                movebtn.lasttop=my-parseInt(movebtn.parentNode.offsetTop);
                movebtn.moveflag=true;
                movebtn.style.cursor="move";
                document.onmousemove=movebtn.onmousemove;
                document.onmouseup=movebtn.onmouseup;
            }
            movebtn.onmouseup=function(){
                movebtn.moveflag=false;
                removeEvent(movebtn,"mousemove",BoxMouseMove,true);
                movebtn.style.cursor="pointer";
                document.onmousemove=null;
                document.onmouseup=null;
            }
        }
        obj.MoveHandler=function(){
            obj.style.left = (x + AdMoveConfig.ScrollX) + "px";
            obj.style.top = (y + AdMoveConfig.ScrollY) + "px";
            rad=(Math.random()+1)*Math.PI/6;
            W=AdMoveConfig.MoveWidth-obj.offsetWidth;
            H=AdMoveConfig.MoveHeight-obj.offsetHeight;
            x = x + step*kx*dirx;
            if (x < 0){dirx = 1;x = 0;kx=Math.sin(rad);ky=Math.cos(rad);} 
            if (x > W){dirx = -1;x = W;kx=Math.sin(rad);ky=Math.cos(rad);}
            y = y + step*ky*diry;
            if (y < 0){diry = 1;y = 0;kx=Math.sin(rad);ky=Math.cos(rad);} 
            if (y > H){diry = -1;y = H;kx=Math.sin(rad);ky=Math.cos(rad);}
        }
        this.SetLocation=function(vx,vy){x=vx;y=vy;}
        this.SetDirection=function(vx,vy){dirx=vx;diry=vy;}
        this.Run=function(){
            var delay = 10;
            interval=setInterval(obj.MoveHandler,delay);
            obj.onmouseover=function(){clearInterval(interval);}
            obj.onmouseout=function(){interval=setInterval(obj.MoveHandler, delay);}
        }
    }
    function CloseIt(obj){
        var w=parseInt(obj.style.width);
        var h=parseInt(obj.style.height);
        if(isNaN(w))w=3;
        if(isNaN(h))h=3;
        w-=3;
        h-=3;
        if(w<=0&&h<=0){
            obj.style.display="none";
            return;
        }
        if(w>0){
            obj.style.width=w + "px";
        }
        if(h>0){
            obj.style.height=h + "px";
        }
        setTimeout(function(){CloseIt(obj);},2);
    }
    //-->
    </script>
</head>
<body>
    <div id="gg1" style="width:100px;height:100px;background-color:red;color:yellow">
        广告1
    </div>
    <div id="gg2" style="width:100px;height:100px;background-color:blue;color:yellow">
        广告2
    </div>
    <div id="gg3" style="width:100px;height:100px;background-color:green;color:yellow">
        广告3
    </div>
    <script type="text/javascript">
    <!--
        var ad1=new AdMove("gg1",true);
        ad1.Run();
        var ad2=new AdMove("gg2",true);
        ad2.Run();
        var ad3=new AdMove("gg3",true);
        ad3.Run();
    //-->
    </script>
</body>
</html>

最后我来运用一个多图飘动的效果支持关闭和移动

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head><title>wahaha</title>
    <meta http-equiv="Content-Type" content="text/html;charset=gb2312" />
    <script type="text/javascript">
    <!--
    //公共脚本文件 main.js
    function addEvent(obj,evtType,func,cap){
        cap=cap||false;
        if(obj.addEventListener){
            obj.addEventListener(evtType,func,cap);
            return true;
        }else if(cap){
            if(document.all){
                obj.setCapture();
            }else{
                document.captureEvents(Event.MOUSEMOVE);
            }
            return true;
        }else if(obj.attachEvent){
            return obj.attachEvent("on" + evtType,func);
        }else{
            return false;
        }
    }
    function removeEvent(obj,evtType,func,cap){
        cap=cap||false;
        if(obj.removeEventListener){
            obj.removeEventListener(evtType,func,cap);
            return true;
        }else if(cap){
            if(document.all){
                obj.releaseCapture();
            }else{
                document.releaseEvents(obj.MOUSEMOVE);
            }
            return true;
        }else if(obj.detachEvent){
            return obj.detachEvent("on" + evtType,func);
        }else{
            return false;
        }
    }
    function getPageScroll(){
        var xScroll,yScroll;
        if (self.pageXOffset) {
            xScroll = self.pageXOffset;
        } else if (document.documentElement && document.documentElement.scrollLeft){
            xScroll = document.documentElement.scrollLeft;
        } else if (document.body) {
            xScroll = document.body.scrollLeft;
        }
        if (self.pageYOffset) {
            yScroll = self.pageYOffset;
        } else if (document.documentElement && document.documentElement.scrollTop){
            yScroll = document.documentElement.scrollTop;
        } else if (document.body) {
            yScroll = document.body.scrollTop;
        }
        arrayPageScroll = new Array(xScroll,yScroll);
        return arrayPageScroll;
    }
    function GetPageSize(){
        var xScroll, yScroll;
        if (window.innerHeight && window.scrollMaxY) {  
            xScroll = document.body.scrollWidth;
            yScroll = window.innerHeight + window.scrollMaxY;
        } else if (document.body.scrollHeight > document.body.offsetHeight){
            xScroll = document.body.scrollWidth;
            yScroll = document.body.scrollHeight;
        } else {
            xScroll = document.body.offsetWidth;
            yScroll = document.body.offsetHeight;
        }
        var windowWidth, windowHeight;
        if (self.innerHeight) {
            windowWidth = self.innerWidth;
            windowHeight = self.innerHeight;
        } else if (document.documentElement && document.documentElement.clientHeight) {
            windowWidth = document.documentElement.clientWidth;
            windowHeight = document.documentElement.clientHeight;
        } else if (document.body) {
            windowWidth = document.body.clientWidth;
            windowHeight = document.body.clientHeight;
        }   
        if(yScroll < windowHeight){
            pageHeight = windowHeight;
        } else { 
            pageHeight = yScroll;
        }
        if(xScroll < windowWidth){   
            pageWidth = windowWidth;
        } else {
            pageWidth = xScroll;
        }
        arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight) 
        return arrayPageSize;
    }
    //广告脚本文件 AdMove.js
    /*
    例子
    <div id="Div2">
        ***** content ******
    </div>
    var ad=new AdMove("Div2");
    ad.Run();
    */
    ////////////////////////////////////////////////////////
    var AdMoveConfig=new Object();
    AdMoveConfig.IsInitialized=false;
    AdMoveConfig.AdCount=0;
    AdMoveConfig.ScrollX=0;
    AdMoveConfig.ScrollY=0;
    AdMoveConfig.MoveWidth=0;
    AdMoveConfig.MoveHeight=0;
    AdMoveConfig.Resize=function(){
        var winsize=GetPageSize();
        AdMoveConfig.MoveWidth=winsize[2];
        AdMoveConfig.MoveHeight=winsize[3];
        AdMoveConfig.Scroll();
    }
    AdMoveConfig.Scroll=function(){
        var winscroll=getPageScroll();
        AdMoveConfig.ScrollX=winscroll[0];
        AdMoveConfig.ScrollY=winscroll[1];
    }
    addEvent(window,"resize",AdMoveConfig.Resize);
    addEvent(window,"scroll",AdMoveConfig.Scroll);
    function AdMove(id,addCloseButton){
        if(!AdMoveConfig.IsInitialized){
            AdMoveConfig.Resize();
            AdMoveConfig.IsInitialized=true;
        }
        AdMoveConfig.AdCount++;
        var obj=document.getElementById(id);
        obj.style.position="absolute";
        var W=AdMoveConfig.MoveWidth-obj.offsetWidth;
        var H=AdMoveConfig.MoveHeight-obj.offsetHeight;
        var x = W*Math.random(),y = H*Math.random();
        var rad=(Math.random()+1)*Math.PI/6;
        var kx=Math.sin(rad),ky=Math.cos(rad);
        var dirx = (Math.random()<0.5?1:-1), diry = (Math.random()<0.5?1:-1);
        var step = 1;
        var interval;
        if(addCloseButton){
            var closebtn=document.createElement("div");
            obj.appendChild(closebtn);
            closebtn.style.position="absolute";
            closebtn.style.top="1px";
            closebtn.style.left=(obj.offsetWidth-28) + "px";
            closebtn.style.width="24px";
            closebtn.style.height="12px";
            closebtn.style.borderStyle="solid";
            closebtn.style.borderWidth="1px";
            closebtn.style.borderColor="#000";
            closebtn.style.backgroundColor="#fff";
            closebtn.style.fontSize="12px";
            closebtn.style.color="#000";
            closebtn.style.cursor="pointer";
            closebtn.innerHTML="关闭";
            closebtn.onclick=function(){
                clearInterval(interval);
                closebtn.onclick=null;
                obj.onmouseover=null;
                obj.onmouseout=null;
                obj.MoveHandler=null;
                AdMoveConfig.AdCount--;
                if(AdMoveConfig.AdCount<=0){
                    removeEvent(window,"resize",AdMoveConfig.Resize);
                    removeEvent(window,"scroll",AdMoveConfig.Scroll);
                    AdMoveConfig.Resize=null;
                    AdMoveConfig.Scroll=null;
                    AdMoveConfig=null;
                }
                obj.removeChild(closebtn);
                obj.style.overflow="hidden";
                setTimeout(function(){CloseIt(obj);},0);
            }
            var movebtn=document.createElement("div");
            obj.appendChild(movebtn);
            movebtn.style.position="absolute";
            movebtn.style.top="1px";
            movebtn.style.left=(obj.offsetWidth-56) + "px";
            movebtn.style.width="24px";
            movebtn.style.height="12px";
            movebtn.style.borderStyle="solid";
            movebtn.style.borderWidth="1px";
            movebtn.style.borderColor="#000";
            movebtn.style.backgroundColor="#fff";
            movebtn.style.fontSize="12px";
            movebtn.style.color="#000";
            movebtn.style.cursor="pointer";
            movebtn.innerHTML="移动";
            function BoxMouseMove(e){
                if(movebtn.moveflag){
                    var mx,my;
                    if(e){
                        mx=e.pageX;
                        my=e.pageY;
                    }else{
                        mx=event.x;
                        my=event.y;
                    }
                    x=mx-movebtn.lastleft;
                    y=my-movebtn.lasttop;
                    movebtn.parentNode.style.left = x + "px";
                    movebtn.parentNode.style.top = y + "px";
                }
            }
            movebtn.onmousemove=function(e){
                BoxMouseMove(e);
            }
            movebtn.onmousedown=function(e){
                var mx,my;
                if(e){
                    mx=e.pageX;
                    my=e.pageY;
                }else{
                    mx=event.x;
                    my=event.y;
                }
                addEvent(movebtn,"mousemove",BoxMouseMove,true);
                movebtn.lastleft=mx-parseInt(movebtn.parentNode.offsetLeft);
                movebtn.lasttop=my-parseInt(movebtn.parentNode.offsetTop);
                movebtn.moveflag=true;
                movebtn.style.cursor="move";
                document.onmousemove=movebtn.onmousemove;
                document.onmouseup=movebtn.onmouseup;
            }
            movebtn.onmouseup=function(){
                movebtn.moveflag=false;
                removeEvent(movebtn,"mousemove",BoxMouseMove,true);
                movebtn.style.cursor="pointer";
                document.onmousemove=null;
                document.onmouseup=null;
            }
        }
        obj.MoveHandler=function(){
            obj.style.left = (x + AdMoveConfig.ScrollX) + "px";
            obj.style.top = (y + AdMoveConfig.ScrollY) + "px";
            rad=(Math.random()+1)*Math.PI/6;
            W=AdMoveConfig.MoveWidth-obj.offsetWidth;
            H=AdMoveConfig.MoveHeight-obj.offsetHeight;
            x = x + step*kx*dirx;
            if (x < 0){dirx = 1;x = 0;kx=Math.sin(rad);ky=Math.cos(rad);} 
            if (x > W){dirx = -1;x = W;kx=Math.sin(rad);ky=Math.cos(rad);}
            y = y + step*ky*diry;
            if (y < 0){diry = 1;y = 0;kx=Math.sin(rad);ky=Math.cos(rad);} 
            if (y > H){diry = -1;y = H;kx=Math.sin(rad);ky=Math.cos(rad);}
        }
        this.SetLocation=function(vx,vy){x=vx;y=vy;}
        this.SetDirection=function(vx,vy){dirx=vx;diry=vy;}
        this.Run=function(){
            var delay = 10;
            interval=setInterval(obj.MoveHandler,delay);
            obj.onmouseover=function(){clearInterval(interval);}
            obj.onmouseout=function(){interval=setInterval(obj.MoveHandler, delay);}
        }
    }
    function CloseIt(obj){
        var w=parseInt(obj.style.width);
        var h=parseInt(obj.style.height);
        if(isNaN(w))w=3;
        if(isNaN(h))h=3;
        w-=3;
        h-=3;
        if(w<=0&&h<=0){
            obj.style.display="none";
            return;
        }
        if(w>0){
            obj.style.width=w + "px";
        }
        if(h>0){
            obj.style.height=h + "px";
        }
        setTimeout(function(){CloseIt(obj);},2);
    }
    //-->
    </script>
</head>
<body>
    <div id="gg1" style="width:100px;height:100px;background-color:red;color:yellow">
        广告1
    </div>
    <div id="gg2" style="width:100px;height:100px;background-color:blue;color:yellow">
        广告2
    </div>
    <div id="gg3" style="width:100px;height:100px;background-color:green;color:yellow">
        广告3
    </div>
<div id="gg4" style="width:100px;height:100px;background-color:#d06b21;color:yellow">
        广告4
    </div>
<div id="gg5" style="width:100px;height:100px;background-color:#0f0c0b;color:yellow">
        广告5
    </div>
<div id="gg6" style="width:100px;height:100px;background-color:#2d9edf;color:yellow">
        广告6
    </div>
<div id="gg7" style="width:100px;height:100px;background-color:#dfd52d;color:yellow">
        广告7
    </div>
<div id="gg8" style="width:100px;height:100px;background-color:#2ddf9a;color:yellow">
        广告8
    </div>
<div id="gg9" style="width:100px;height:100px;background-color:#df2daf;color:yellow">
        广告9
    </div>
<div id="gg10" style="width:100px;height:100px;background-color:#8709bc;color:yellow">
        广告10
    </div>
    <script type="text/javascript">
    <!--
        var ad1=new AdMove("gg1",true);
        ad1.Run();
        var ad2=new AdMove("gg2",true);
        ad2.Run();
        var ad3=new AdMove("gg3",true);
        ad3.Run();
var ad4=new AdMove("gg4",true);
        ad4.Run();
var ad5=new AdMove("gg5",true);
        ad5.Run();
var ad6=new AdMove("gg6",true);
        ad6.Run();
var ad7=new AdMove("gg7",true);
        ad7.Run();
var ad8=new AdMove("gg8",true);
        ad8.Run();
var ad9=new AdMove("gg9",true);
        ad9.Run();
var ad10=new AdMove("gg10",true);
        ad10.Run();
    //-->
    </script>
</body>
</html>

漂浮广告，兼容ie、firefox，多个漂浮不冲突，调用只需两行代码

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