一个网上流传的超经典的js代码，运行一下就知道有多酷了。
<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="一个网下流传的超经典的js代码，运行一上就知道有多酷了"};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.dyclasselse 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-24else popLeftAdjust=0;if(MouseY+12+popHeight>document.body.clientHeight) popTopAdjust=-popHeight-24else 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>?