var timeout    = 500;
   var closetimer = 0;
   var ddmenuitem = 0;
   var maskFlg = false;
   
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()
    { 
	   $('#main-nav > li').bind('mouseover', jsddm_open);
       $('#main-nav > li').bind('mouseout',  jsddm_timer);
	 });
  

document.onclick = jsddm_close;