var timeout    = 500;
	var closetimer = 0;
	var ddmenuitem = 0;
	
	function jsddm_open()
	{  jsddm_canceltimer();
	   jsddm_close();
	   ddmenuitem = $(this).find('ul').css('visibility', 'visible');}
	
	function jsddm_close()
	{  if(ddmenuitem) ddmenuitem.css('visibility', 'hidden');}
	
	function jsddm_timer()
	{  closetimer = window.setTimeout(jsddm_close, timeout);}
	
	function jsddm_canceltimer()
	{  if(closetimer)
	   {  window.clearTimeout(closetimer);
		  closetimer = null;}}
	
	$(document).ready(function()
	{  $('#drop_menu > li').bind('mouseover', jsddm_open)
	   $('#drop_menu > li').bind('mouseout',  jsddm_timer)});
	
	document.onclick = jsddm_close;