var timeout    = 250;
var closetimer = 0;
var menuItem = 0;
var parent = 0;

function dropDown_open()
{  dropDown_canceltimer();
   dropDown_close();                                             
   parent = $(this).addClass('parent');
   menuItem = $(this).find('ul').css('visibility', 'visible');}

function dropDown_close(){                 
    if(menuItem) {
        menuItem.css('visibility', 'hidden');
        $(parent).removeClass('parent');
    }
}

function dropDown_timer()
{  closetimer = window.setTimeout(dropDown_close, timeout);}

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

$(document).ready(function(){  
    $('#dropDown > li').bind('mouseover', dropDown_open)
    $('#dropDown > li').bind('mouseout',  dropDown_timer)
});

//document.onclick = dropDown_close;