function SwitchMenu(menu,obj) {
	if ((document.getElementById) && (document.getElementsByTagName)) {

		var menuobj = document.getElementById(menu);
		if (menuobj!=null) {

			var ar = menuobj.getElementsByTagName("div");
			for (var i=0; i<ar.length; i++) {

				// handle arrows
				if (ar[i].className=="menu_title") {
					var arr = ar[i].getElementsByTagName("img");
					for (var j=0; j<arr.length; j++) {
						if (arr[j].className=="menu_arrowdown") {
							if ((obj!=null) && (ar[i].id==(menu+"_"+obj+"_title")) && (arr[j].style.display!="inline")) {
								arr[j].style.display = "inline";
							} else {
								arr[j].style.display = "none";
							}
						}
						if (arr[j].className=="menu_arrowright") {
							if ((obj!=null) && (ar[i].id==(menu+"_"+obj+"_title")) && (arr[j].style.display!="none")) {
								arr[j].style.display = "none";
							} else {
								arr[j].style.display = "inline";
							}
						}
					}
				}

				// handle submenus
				if (ar[i].className=="menu_sub") {
					if ((obj!=null) && (ar[i].id==(menu+"_"+obj+"_sub")) && (ar[i].style.display!="block")) {
						ar[i].style.display = "block";
					} else {
						ar[i].style.display = "none";
					}
				}

			}
		}

	}
}