function viewAdditionalMenu(menu) {			
		document.getElementById("additional_menu_"+menu).style.display = 'block';
		var i;
		for (i=1; i<5; i++)
		if (menu!=i)
		{
			document.getElementById("additional_menu_"+i).style.display = 'none';
		}
	}
	function closeAdditionalMenu() {			
		var i;
		for (i=1; i<5; i++)
		{
			document.getElementById("additional_menu_"+i).style.display = 'none';
		}
	}