function HideAllChildMenu() {
		headerTable = document.getElementById("header-menu");
		childs = headerTable.getElementsByTagName("div");
		for (i=0;i<childs.length;i++) {
			if (childs[i].dir == "ltr") {
				childs[i].style.display = "none";
			}	
		}
	}

	function ShowChildMenu(childId) {
		HideAllChildMenu();
		if (document.getElementById(childId)) {
			child = document.getElementById(childId);
			child.style.display = "block";
		}
	}
	
	function HideChildMenu(childId) {
		if (document.getElementById(childId)) {
			child = document.getElementById(childId);
			child.style.display = "none";
		}
	}