eu tenho um script q faz isso com a opacidade, tente modificá-lo para q ele sirva para o q vc quer...
coloque isso depois de <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>
na tag IMG, coloque o seguinte...
onMouseOver="nereidFade(this,100,30,5)" onMouseOut="nereidFade(this,25,50,5)"
:ok: