Buongiorno a tutti,

ho questo script in js che simula effetto alpha

codice:
<html>

<head>
<meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
<title>Nuova pagina 1</title>
</style >
<TITLE></TITLE>
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1">
<script language="JavaScript">
<!--
<!--

//-->
// Flash Image Extension for Dreamwever ,by Yichun Yuan(dezone@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>
<a href="http://#" target="_blank">
<img src=immagine.gif alt="Ciao" border="0"  style="FILTER: alpha(opacity=55)" onMouseOver=nereidFade(this,300,10,5) onMouseOut=nereidFade(this,50,10,5)>
</a>

</body>

</html>
il problema e che con IE funziona ma con firefox ne avete qualcuno che giri anche su firefox???