var lastmenu = "";

function display_menu(obj) {
	document.getElementById(obj).style.visibility="visible";
}

function display_upper_menu(obj) {
	if (lastmenu != "") {
		document.getElementById(lastmenu).style.visibility="hidden";
	}
	lastmenu = obj;
	if (obj != "") {
		display_menu(obj);
	}
}


function showIt(object) {
	if (document.getElementById) {
		document.getElementById(object).style.visibility = 'visible';
	} else if (document.layers && document.layers[object] != null) {
		document.layers[object].visibility = 'visible';
	} else if (document.all) {
		document.all[object].style.visibility = 'visible';
	}
	return false;
}

function hideIt(object) {
	if (document.getElementById) {
		document.getElementById(object).style.visibility = 'hidden';
	} else if (document.layers && document.layers[object] != null) {
		document.layers[object].visibility = 'hidden';
	} else if (document.all) {
		document.all[object].style.visibility = 'hidden';
	}
	return false;
}

function new_window(jlink) {
	window.open(jlink,'','width=500, height=500,left=100,top=100,screenX=100,screenY=100, resizable=no, scrollbars=no, toolbar=no, status=no, menubar=no, copyhistory=no');
}