.clear_both {
	clear:both;
	font-size:0px;
	height:0px;
	line-height:0px;
}
.clear_left {
	clear:left;
	font-size:0px;
	height:0px;
	line-height:0px;
}
.clear_right {
	clear:right;
	font-size:0px;
	height:0px;
	line-height:0px;
}