var timeout    = 50;
var closetimer = 0;
var ddmenuitem = 0;

function jsddm_open() {  
	jsddm_canceltimer();
	jsddm_close();
   	ddmenuitem = $(this).find('ul').css('display', 'block');
}
function jsddm_close() {
	if(ddmenuitem) ddmenuitem.css('display', 'none');
}
function jsddm_timer() {
	closetimer = window.setTimeout(jsddm_close, timeout);
}
function jsddm_canceltimer() {
	if(closetimer) {
		window.clearTimeout(closetimer);
      	closetimer = null;
	}
}
$(document).ready(function() {
						   $('#nav > li').bind('mouseover', jsddm_open)
						   $('#nav > li').bind('mouseout',  jsddm_timer)
});
document.onclick = jsddm_close;