JavaScript动态控制图片透明度的变化

<title>JavaScript动态控制图片透明度的变化</title>

<script language=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>

<a href="/"><img src="logo.gif" border=0 onMouseOut=nereidFade(this,50,10,5) onMouseOver=nereidFade(this,100,10,5) style="FILTER: alpha(opacity=40)"></a>