function displaySubMenu(li) {
	var subMenu = li.getElementsByTagName("ul")[0];
	subMenu.style.display = "block";
}
function hideSubMenu(li) {
	var subMenu = li.getElementsByTagName("ul")[0];
	subMenu.style.display = "none";
}
function switchLogo(elem) {
	if(elem.className == "logo") {
	    elem.className = "logo1"
	} else {
	    elem.className = "logo"
	}
}