var t;
function showAboutUsSubmenu() {
	clearTimeout(t);
	document.getElementById('submenu_services').style.display = 'none';
	document.getElementById('submenu_about_us').style.display = 'block';
}
function showServicesSubmenu() {
	clearTimeout(t);
	document.getElementById('submenu_about_us').style.display = 'none';
	document.getElementById('submenu_services').style.display = 'block';
}
function hideSubmenus() {
	t = setTimeout("hideSubmenusImmt()",500);
}
function hideSubmenusImmt() {
	document.getElementById('submenu_about_us').style.display = 'none';
	document.getElementById('submenu_services').style.display = 'none';
	clearTimeout(t);
}