//locate page active tab
	var orig_id
	function find_org() {
		for (j=1;j<6;j++) {
			curr_id="top"+j;
			curr_tab = document.getElementById(curr_id).className;
			if (curr_tab == curr_id+"_on") {
				orig_id = curr_id;
				break;
			}
		}
	}
	function css_update(classname) {
		reset_css();
		document.getElementById(classname).setAttribute("class", classname+"_on");
	}
	
	function reset_css() {
		for (j=1;j<6;j++) {
			curr_id="top"+j;
			if (curr_id != orig_id) {
				document.getElementById(curr_id).setAttribute("class", curr_id);
			}
			
		}
	}