var timeout    = 100;
var closetimer = 0;
var ddmenuitem = 0;

function main_menu_open(){  main_menu_canceltimer();
   main_menu_close();
   //ddmenuitem = $(this).find('div').show();
	 ddmenuitem = $(this).find('div').show();
}

function main_menu_close(){
  //if(ddmenuitem) ddmenuitem.hide();
	if(ddmenuitem) ddmenuitem.hide();
}

function main_menu_timer()
{  closetimer = window.setTimeout(main_menu_close, timeout);}

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

$(document).ready(function(){  
		$('ul#main_menu > li').bind('mouseover', main_menu_open);
	  $('ul#main_menu > li').bind('mouseout',  main_menu_timer);
	});

document.onclick = main_menu_close();