.tbl_topics {
	width: 500px;
	margin: auto;
	text-align: left;
	vertical-align: top;
}
.tbl_topics ul {
	font-size: 14px;
	float: left;
	padding-left: 20px;
	margin-left: 20px;
	margin-bottom: 0px;
}
.div_backnumber {
	width: 500px;
	margin: auto;
	font-size: 12px;
	color: #666666;
}
.div_backnumber div {
	width: 33%;
	float: left;
}