非常不错的javascript 图片慢慢下层效果

<SCRIPT language=JavaScript> 
nereidFadeObjects = new Object(); 
nereidFadeTimers = new Object(); 
function nereidFade(object, destOp, rate, delta){ 
if (!document.all) 
return 
    if (object != "[object]"){  //do this so I can take a string too 
        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); 
    } 
} 
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