var ddmenuitem = 0;

	function menu_open()
	{  
		menu_close(); //close the last menu opened
		ddmenuitem = $(this).find('ul').css('visibility', 'visible');
	}
	
	function menu_close()
	{  if(ddmenuitem) ddmenuitem.css('visibility', 'hidden');}
	
	$(document).ready(function()
	{
		$('#menuNav > li').bind('mouseover', menu_open)
		$('#menuNav > li').bind('mouseout',  menu_close)
	});