var ID  = (!document.all && document.getElementById);
var ALL = (document.all);

function control_menu(id,mode) {
if (id) {
	if (mode)  value = 'visible';
	if (!mode) value = 'hidden';
	if (navigator.userAgent.match("MSIE")) {
		if (value == "visible") _all_select_menu('hidden');
		if (value == "hidden")  _all_select_menu('visible');
	}
	if (ID) {
		document.getElementById(id).style.visibility = value;
		return;
	}
	if (ALL) {
		document.all[id].style.visibility = value;
		return;
	}
}
}

function _all_select_menu(value) {
for (var i = 0; i < document.forms.length; i++) {
	for (var j = 0; j < document.forms[i].elements.length; j++) {
		if (document.forms[i].elements[j].type.match("select")) {
			document.forms[i].elements[j].style.visibility = value;
			}
		}
	}
}