var timeout    = 2500;
		var closetimer = 0;
		var ddmenuitem = 0;

		function nav_open()
		{  nav_canceltimer();
		   nav_close();
		   ddmenuitem = $(this).find('ul').css('visibility', 'visible');}

		function nav_close()
		{  if(ddmenuitem) ddmenuitem.css('visibility', 'hidden');}

		function nav_timer()
		{  closetimer = window.setTimeout(nav_close, timeout);}

		function nav_canceltimer()
		{  if(closetimer)
		   {  window.clearTimeout(closetimer);
		      closetimer = null;}}

		$(document).ready(function()
		{  $('#nav > li').bind('mouseover', nav_open)
		   $('#nav > li').bind('mouseout',  nav_timer)});