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; 
}