$(document).ready(function(){

	// use the css file to get the base url
	cssUrl = $("link[rel=stylesheet]").attr('href').replace('//','/')
	baseUrl = cssUrl.substring(0,cssUrl.indexOf('/css/'))

	// preload submenu background image
	submenuImage = new Image();
	submenuImage.src = baseUrl+'imgs/bgs/submenu.png'

	// preload menu:over background image
	menuOverImage = new Image();
	menuOverImage.src = baseUrl+'imgs/bgs/menu_.png'

})