.node .node_7 .forumNodeInfo .nodeIcon, .node .node_7 .categoryForumNodeInfo .nodeIcon {
background-image: url("http://path/to/image.jpg");
background-position: 0 0;
background-repeat: no-repeat;
width: 36px;
height: 36px;
filter:alpha(opacity=60);
-moz-opacity:0.6;
-khtml-opacity: 0.6;
opacity: 0.6;
}
.node .node_7 .forumNodeInfo.unread .nodeIcon, .node .node_7 .categoryForumNodeInfo.unread .nodeIcon {
background-image: url("http://path/to/image.jpg");
background-position: 0 0;
background-repeat: no-repeat;
width: 36px;
height: 36px;
filter:alpha(opacity=100);
-moz-opacity:1;
-khtml-opacity: 1;
opacity: 1;
}