JavaScript延时效果比较不错的

<script  language="javascript" type="text/javascript"> nereidFadeObjects = new Object(); nereidFadeTimers = new Object(); function nereidFade(object, destOp, rate, delta){ if (!document.all) return     if (object != "[object]"){ setTimeout("nereidFade("+object+","+destOp+","+rate+","+delta+")",0);         return;     }     clearTimeout(nereidFadeTimers[object.sourceIndex]);     diff = destOp-object.filters.alpha.opacity;     direction = 1;     if (object.filters.alpha.opacity > destOp){         direction = -1;     }     delta=Math.min(direction*diff,delta);     object.filters.alpha.opacity+=direction*delta;     if (object.filters.alpha.opacity != destOp){         nereidFadeObjects[object.sourceIndex]=object;         nereidFadeTimers[object.sourceIndex]=setTimeout("nereidFade(nereidFadeObjects["+object.sourceIndex+"],"+destOp+","+rate+","+delta+")",rate);     } } </script> <style type="text/css">      </style> <div style="margin-top:20px;" align="center"> <ul id="menu"> <li style="background-image:url(/pic/ma_1.gif)"><img src='/pic/Mb_1.gif' alt="工作室 |  Studio" border='0' style='FILTER: alpha(opacity=0)' onmouseover=nereidFade(this,100,10,7) onmouseout=nereidFade(this,01,70,5)></li><li style="background-image:url(/pic/ma_2.gif)"><img src='/pic/Mb_2.gif' alt="油画 | Canvas" border='0' style='FILTER: alpha(opacity=0)' onmouseover=nereidFade(this,100,10,7) onmouseout=nereidFade(this,01,70,5)></li><li style="background-image:url(/pic/ma_3.gif)"><img src='/pic/Mb_3.gif' alt="唐装 | Tangsuit" border='0' style='FILTER: alpha(opacity=0)' onmouseover=nereidFade(this,100,10,7) onmouseout=nereidFade(this,01,70,5)></li><li style="background-image:url(/pic/ma_4.gif)"><img src='/pic/Mb_4.gif' alt="美玉 | Jade" border='0' style='FILTER: alpha(opacity=0)' onmouseover=nereidFade(this,100,10,7) onmouseout=nereidFade(this,01,70,5)></li><li style="background-image:url(/pic/ma_5.gif)"><img src='/pic/Mb_5.gif' alt="导航 | Gps" border='0' style='FILTER: alpha(opacity=0)' onmouseover=nereidFade(this,100,10,7) onmouseout=nereidFade(this,01,70,5)></li></ul> </div>