.thread-collapse-control a {
	display: block;
	outline: none;
	width: 17px;
	height: 17px;
	background: url( ../images/thread_collapse_control_expanded.gif ) 0 0 no-repeat;
	text-indent: -9999px;
}
.thread-collapse-control a.thread-control-collapsed {
	background: url( ../images/thread_collapse_control_collapsed.gif ) 0 0 no-repeat;
}