var mnuSelected = '';
var subMnuSelected = '';
var hasDOM = false;
if (document.getElementById) {
	hasDOM = true;
}
function showMenu(menu){
	hideMenu(mnuSelected);
	if (hasDOM == true) {
		document.getElementById(menu).style.visibility = 'visible';
	} else {
		eval("document." + menu + ".visibility='show';");
	}
	mnuSelected = menu;
}
function hideMenu(menu){
	if(mnuSelected!='') {
		if (hasDOM == true) {
			document.getElementById(menu).style.visibility = 'hidden';
		} else {
			eval("document." + menu + ".visibility='hide';");
		}
	}
}
function showSubMenu(menu){
	hideSubMenu(subMnuSelected);
	if (hasDOM == true) {
		document.getElementById(menu).style.visibility = 'visible';
	} else {
		eval("document." + menu + ".visibility='show';");
	}
	subMnuSelected = menu;
}
function hideSubMenu(menu){
	if(subMnuSelected!='') {
		if (hasDOM == true) {
			document.getElementById(menu).style.visibility = 'hidden';
		} else {
			eval("document." + menu + ".visibility='hide';");
		}
	}
}