var last_clicked = null;

	function check_menu_over(image_id){
		re=new RegExp('_01.gif','gi');
		image_id.src=image_id.src.replace(re,"_02.gif");
	}

	function check_menu_out(image_id){
		re=new RegExp('_02.gif','gi');
		image_id.src=image_id.src.replace(re,"_01.gif");
	}
	
	function show_submenu_div(div_id){

		if(document.getElementById(div_id).style.display=='block'){
			document.getElementById(div_id).style.display='none';
		} else {
			document.getElementById(div_id).style.display='block';
		}
	}
	
	function openWin( windowURL, windowName, windowFeatures ) { 
		return window.open( windowURL, windowName, windowFeatures ) ; 
	}
	
	function set_CSS(el_id, CSS_attr, CSS_val) { 
	var el = document.getElementById(el_id); 
	if (el) el.style[CSS_attr] = CSS_val; 
	}