#page_shell{width:960px;margin-left:auto;margin-right:auto;}#main_frame{display:block;width:600px;margin:0;padding:0 10px 0 10px;overflow:hidden;float:left;}#main_frame div{overflow:hidden;}#right_frame{display:block;width:170px;float:right;}#left_frame{display:block;width:170px;float:left;}#footer_frame{float:none;clear:both;}