这个漂浮的东东要怎么搞??

<html>
<head>
<script language=JavaScript>
//***********默认设置定义.*********************
tPopWait=2; //设置停留多少豪秒后显示提示。
tPopShow=1000; //设置显示多少豪秒后关闭提示
showPopStep=1; //设置完成显示的速度
popOpacity=60; //设置显示透明度
backColor='#f4ffe0'; //设置背景颜色
fontColor='#000000'; //设置字体颜色
borderColor='#006600'; //设置边框颜色
fontSize=9; //设置字体大小
//***************内部变量定义*****************
sPop=null;
curShow=null;
tFadeOut=null;
tFadeIn=null;
tFadeWaiting=null;
document.write("<style type='text/css'id='defaultPopStyle'>");
document.write(".cPopText { background-color:");
document.write(backColor); //设置背景颜色
document.write(";color:");
document.write(fontColor); //设置字体颜色
document.write(";border: 1px ");
document.write(borderColor); //设置边框颜色
document.write(" solid;font-size:");
document.write(fontSize); //设置字体大小
document.write("pt;padding:2px;filter: Alpha(Opacity=0)}");
document.write("</style>");
document.write("<div id='dypopLayer' style='position:absolute;z-index:1000;' class='cPopText'></div>");
function showPopupText(){
var o=event.srcElement;
MouseX=event.x;
MouseY=event.y;
if(o.alt!=null && o.alt!=""){o.dypop=o.alt;o.alt=""};
if(o.title!=null && o.title!=""){o.dypop=o.title;o.title=""};
if(o.dypop!=sPop) {
sPop=o.dypop;
clearTimeout(curShow);
clearTimeout(tFadeOut);
clearTimeout(tFadeIn);
clearTimeout(tFadeWaiting);
if(sPop==null || sPop=="") {
dypopLayer.innerHTML="";
dypopLayer.style.filter="Alpha()";
dypopLayer.filters.Alpha.opacity=0;
}
else {
if(o.dyclass!=null) popStyle=o.dyclass
else popStyle="cPopText";
curShow=setTimeout("showIt()",tPopWait);
}}}
function showIt(){
dypopLayer.className=popStyle;
dypopLayer.innerHTML=sPop;
popWidth=dypopLayer.clientWidth;
popHeight=dypopLayer.clientHeight;
if(MouseX+12+popWidth>document.body.clientWidth) popLeftAdjust=-popWidth-24
else popLeftAdjust=0;
if(MouseY+12+popHeight>document.body.clientHeight) popTopAdjust=-popHeight-24
else popTopAdjust=0;
dypopLayer.style.left=MouseX+12+document.body.scrollLeft+popLeftAdjust;
dypopLayer.style.top=MouseY+12+document.body.scrollTop*2;//+popTopAdjust;
dypopLayer.style.filter="Alpha(Opacity=0)";
fadeOut();
}
function fadeOut(){
if(dypopLayer.filters.Alpha.opacity<popOpacity) {
dypopLayer.filters.Alpha.opacity+=showPopStep;
tFadeOut=setTimeout("fadeOut()",1);
}
else {
dypopLayer.filters.Alpha.opacity=popOpacity;
tFadeWaiting=setTimeout("fadeIn()",tPopShow);
}}
function fadeIn(){
if(dypopLayer.filters.Alpha.opacity>0) {
dypopLayer.filters.Alpha.opacity-=1;
tFadeIn=setTimeout("fadeIn()",1);
}}
document.onmouseover=showPopupText;
</script>
</head>
<body>
<a href="#" title="看到超酷效果了吗？请停留一会儿，它会慢慢消失！<br/>怎么样，不错吧？<br/><img src='http://bbs.blueidea.com/images/blue/logo.gif' />">请把鼠标移到这里，看看效果！</a>
</body>
</html>这个效果,要用到层,OK,望给分,