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()
{  $('#jsddm > li').bind('mouseover', jsddm_open);
   $('#jsddm > li').bind('mouseout',  jsddm_timer);
});

document.onclick = jsddm_close;