var timeout		= 500;
var closetimer	= 0;
var menu_item	= 0;

function mainMenu_open() {
	mainMenu_canceltimer();
	mainMenu_close();
	menu_item = $(this).find('ul').css('visibility', 'visible');
}

function mainMenu_close() {
	if(menu_item) {
		menu_item.css('visibility', 'hidden');
	}
}

function mainMenu_timer() {
	closetimer = window.setTimeout(mainMenu_close, timeout);
}

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

$(document).ready(function() {
	$('#mainMenu > li').bind('mouseover', mainMenu_open);
	$('#mainMenu > li').bind('mouseout',  mainMenu_timer);
});

document.onclick = mainMenu_close;