js仿照图片实现的渐变效果

<HTML>
<HEAD>
<TITLE>dancepower.cn</TITLE>
<SCRIPT language=JavaScript> 
// Flash table Extension for Dreamwever ,by dio(diopex@sina.com)
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);
 }
}
</SCRIPT>
</HEAD>
<BODY text=#000000 bgColor=#ffffff leftMargin=0 topMargin=0 marginheight="0" 
marginwidth="0">
<TABLE height="100%" cellSpacing=0 cellPadding=0 width="100%" border=0>
 <TBODY>
 <TR>
 <TD align=middle>
 <TABLE borderColor=#ffffff height=100 cellSpacing=1 cellPadding=1 
 width=100 align=center bgColor=#000033 border=1>
 <TBODY>
 <TR align=middle>
 <TD onmouseover=nereidFade(this,100,10,5) 
 style="FILTER: alpha(opacity=70)" onmouseout=nereidFade(this,50,10,5) 
 bgColor=#00ccff><FONT face=verdana color=#ffffff 
size=1>dio</FONT></TD>
 <TD onmouseover=nereidFade(this,100,10,5) 
 style="FILTER: alpha(opacity=70)" onmouseout=nereidFade(this,50,10,5) 
 bgColor=#ff9900><FONT face=verdana color=#ffffff 
 size=1>pex</FONT></TD></TR>
 <TR align=middle>
 <TD onmouseover=nereidFade(this,100,10,5) 
 style="FILTER: alpha(opacity=70)" onmouseout=nereidFade(this,50,10,5) 
 bgColor=#ff3399><FONT face=verdana color=#ffffff 
size=1>pex</FONT></TD>
 <TD onmouseover=nereidFade(this,100,10,5) 
 style="FILTER: alpha(opacity=70)" onmouseout=nereidFade(this,50,10,5) 
 bgColor=#33ff66><FONT face=verdana color=#ffffff
 size=1>dio</FONT></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></BODY></HTML>
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javascript 特效

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