$(document).ready( function() {
		var timeout    = 500;
		var closetimer = 0;
		var ddmenuitem = 0;
		
		function MenuDeroulant_open() {
			MenuDeroulant_canceltimer();
			MenuDeroulant_close();
			ddmenuitem = $(this).find('ul').css('visibility', 'visible');
		}
		
		function MenuDeroulant_close() {
			if(ddmenuitem) ddmenuitem.css('visibility', 'hidden');
		}
		
		function MenuDeroulant_timer() {
			closetimer = window.setTimeout(MenuDeroulant_close, timeout);
		}
		
		function MenuDeroulant_canceltimer() {
			if(closetimer) {
				window.clearTimeout(closetimer);
				closetimer = null;
			}
		}
		
		$(document).ready(function() {
			$('nav > ul > li').bind('mouseover', MenuDeroulant_open);
			$('nav > ul > li').bind('mouseout',  MenuDeroulant_timer)
		});
		
		document.onclick = MenuDeroulant_close;
	});