.cat_category_icon_first{
	display: block;
	width: 100px;
	height: 100px;
	text-indent: -1000px;
	overflow: hidden;
	margin: 10px;
}
.cat_category_icon_first:hover{
	filter: alpha(opacity=30);
	-moz-opacity: .30;
	opacity: .30;
}
.cat_category_icon{
	display: block;
	width: 50px;
	height: 50px;
	text-indent: -1000px;
	overflow: hidden;
	margin-top: 10px;
}
.cat_category_icon:hover{
	filter: alpha(opacity=30);
	-moz-opacity: .30;
	opacity: .30;
}