CSS3 Hover Opacity

a img.feed { 
	border: none; 
	opacity: 1.0;
	-ms-filter: "progid:DXImageTransform.Microsoft.
	Alpha(Opacity=100)";
	filter: alpha(opacity = 100);
	-webkit-transition: opacity 0.2s ease-in-out; 
	-moz-transition: opacity 0.2s ease-in-out;
	-o-transition: opacity 0.2s ease-in-out;
	transition: opacity 0.2s ease-in-out; }
 
a:hover img.feed,
a:focus img.feed { 
	opacity: 0.70;
	-ms-filter: "progid:DXImageTransform.Microsoft.
	Alpha(Opacity=70)";
	filter: alpha(opacity = 70);  }