此博客展示了一段HTML代码，通过JavaScript函数nereidFade实现图像透明度渐变效果。代码中定义了对象和定时器，根据鼠标悬停和移出事件改变图像的透明度，涉及Google的图片展示。
<html>
<body>
<script>
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>
</body>
<img src="http://www.google.com/images/logo_sm.gif" id="logo" border=0 style="FILTER: alpha(opacity=50)" onMouseOver=nereidFade(this,100,40,5) onMouseOut=nereidFade(this,30,40,5)>
</body>
</html>
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