html{
	overflow:-moz-scrollbars-vertical;
	}
#page_content{
	overflow:hidden;
	}
#page_content #content_sidebar.left {
	float:left;
	}
#page_content #content_sidebar.right {
	float:right;
	}
#page_content .left {
	float:left;
	}
#page_content .right {
	float:right;
	}
.center {
	 text-align:center; 
	 }
.clear {
	clear:both; 
	}