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[摘 要]
把下面的代码加入<head>...</head>之间：
var?brOK=false;???
var?mie=false;??
var?aver=parseInt(navigator.appVersion.substring(0,1));???
var?aname=navigator.appName;???
?? //check?browser???
function?checkbrOK()???
{
? if(aname.indexOf("Internet?Explorer")!=-1)???
? {
?? if(aver>=4)?
??? brOK=navigator.javaEnabled();??
?? mie=true;???
? }??
? if(aname.indexOf("Netscape")!=-1)?????
? {
?? if(aver>=4)?
??? brOK=navigator.javaEnabled();
? }??
}??
var?vmin=5;??
var?vmax=2;??
var?vr=2;??
var?timer1;??
function?Chip(chipname,width,height)??
{?
??? this.named=chipname;??
??? this.vx=vmin+vmax*Math.random();??
??? this.vy=vmin+vmax*Math.random();??
??? this.w=width;??
??? this.h=height;??
??? this.xx=0;??
??? this.yy=0;??
??? this.timer1=null;??
}??
function?movechip(chipname)?
{??
??? if(brOK)??
??? {
?? eval("chip="+chipname);??
?? if(!mie)??
?? {
??? pageX=window.pageXOffset;??
??? pageW=window.innerWidth;??
??? pageY=window.pageYOffset;??
??? pageH=window.innerHeight;??
?? }??
?? else??
?? {
??? pageX=window.document.body.scrollLeft;??
??? pageW=window.document.body.offsetWidth-8;??
??? pageY=window.document.body.scrollTop;??
??? pageH=window.document.body.offsetHeight;??
?? }???
?? chip.xx=chip.xx+chip.vx;??
?? chip.yy=chip.yy+chip.vy;??
?? chip.vx+=vr*(Math.random()-0.5);??
?? chip.vy+=vr*(Math.random()-0.5);??
?? if(chip.vx>(vmax+vmin))??chip.vx=(vmax+vmin)*2-chip.vx;??
?? if(chip.vx<(-vmax-vmin))?chip.vx=(-vmax-vmin)*2-chip.vx;??
?? if(chip.vy>(vmax+vmin))??chip.vy=(vmax+vmin)*2-chip.vy;??
?? if(chip.vy<(-vmax-vmin))?chip.vy=(-vmax-vmin)*2-chip.vy;??
?? if(chip.xx<=pageX)??
?? {
??? chip.xx=pageX;??
??? chip.vx=vmin+vmax*Math.random();??
?? }??
?? if(chip.xx>=pageX+pageW-chip.w)??
?? {
??? chip.xx=pageX+pageW-chip.w;??
??? chip.vx=-vmin-vmax*Math.random();??
?? }??
?? if(chip.yy<=pageY)??
?? {
??? chip.yy=pageY;??
??? chip.vy=vmin+vmax*Math.random();??
?? }??
?? if(chip.yy>=pageY+pageH-chip.h)??
?? {
??? chip.yy=pageY+pageH-chip.h;??
??? chip.vy=-vmin-vmax*Math.random();??
?? }??
?? if(!mie)??
?? {
??? eval("document."+chip.named+".top?="+chip.yy);???
??? eval("document."+chip.named+".left="+chip.xx);???
?? }????
?? else???
?? {
??? eval("document.all."+chip.named+".style.pixelLeft="+chip.xx);???
??? eval("document.all."+chip.named+".style.pixelTop?="+chip.yy);???
?? }???
?? chip.timer1=setTimeout("movechip(""+chip.named+"")",100);???
? }???
}???
function?stopme(chipname)??
{
? if(brOK)??
? {//alert(chipname)??
?? eval("chip="+chipname);??
?? if(chip.timer1!=null)????
?? {
??? clearTimeout(chip.timer1);
?? }??
? }
}???
var?floater;??
function?floater()???
{
? checkbrOK();????
???? floater=new?Chip("floater",0,0);??
???? if(brOK)???
???? {
?? movechip("floater");??
? }
? }??
把下面的代码加入<body>...</body>之间：
<div?id=floater?style="HEIGHT:?0px;? POSITION:?absolute; ?WIDTH:?0px;?left:?680px;?top:?150px;?z-index:100"?>
<a?href=http://www.webdn.com?arget=_blank>
<img?border=0?src=http://www.webdn.com/images/logo.gif></a>
</div>
这里你可以改成自己要的图片路径．
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