div界面浮动插件

<title>JS浮动广告</title> 
<style type="text/css"> 
img{border:0;} 
</style> 
<SCRIPT type=text/javascript> 
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; 
} 
 
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> 
<DIV id=ad1 style="Z-INDEX: 5"> 
    <div>
        <IMG src="shangshui.jpg">
    </div> 
</DIV> 
<SCRIPT type=text/javascript><!-- 
var ad1=new AdMove("ad1"); 
ad1.Run(); 
        //多组漂浮 
        //var ad1=new AdMove("ad2"); 
//ad2.Run(); 
//--> 
</SCRIPT>