var menuTimerId = 0;

function DelayHideSubMenu() {
	menuTimerId = setTimeout('HideSubMenu()', 300)
}
function ShowSubMenu() {
	clearTimeout (menuTimerId);
	document.getElementById('aboutus_submenu').style.display = "block";
}

function HideSubMenu() {
	document.getElementById('aboutus_submenu').style.display = "none"
}