function expand(id) {
	if($(id).style.display=='none') {
		Element.show('menu_overlay');
		if(typeof(expandedId)!="undefined") {
			
			Effect.BlindUp(expandedId, {duration: 0.3, queue: 'front'});
		}
		Effect.BlindDown(id, { duration: 0.5, queue: 'end', afterFinish: function(effect) {Element.hide('menu_overlay')} });
		expandedId=id;
		
	}	
}