#main_skin{position:fixed;left:0px;bottom:0px;width:100%;}
#left_skin{background-image:url(../images/body/body_left.jpg);float:left;width:300px;height:1200px;}
#right_skin{background-image:url(../images/body/body_right.jpg);float:right;width:300px;height:1200px;}