CSS Cross Browser Transparency Opacity Image Effects Hover ie Firefox

sample code

<style type=”text/css”>
 img{filter: alpha(opacity=10);
opacity:.10;
-ms-filter: “progid:DXImageTransform.Microsoft.Alpha(Opacity=10)”; /*–IE 8 Transparency–*/
}
 a:hover img{filter: alpha(opacity=70);
opacity:.70;
-ms-filter: “progid:DXImageTransform.Microsoft.Alpha(Opacity=70)”;
/*–IE 8 Transparency–*/
}
</style>