menuTimeouts = new Array();
visibleMenu = "";

function showMenu(menuID)
{
	var menu = document.getElementById(menuID);
	menu.className = 'subMenu subMenuVisible';
	
	if (visibleMenu != "" && visibleMenu != menuID) {
		hideMenu(visibleMenu, false);
	}
	visibleMenu = menuID;
	
	// vymazání timeoutů
	for (key in menuTimeouts) {
		var timeout = menuTimeouts[key];
		window.clearTimeout(timeout);
	}
}

function hideMenu(menuID, useTimeout)
{
	if (menuID == "") {
		return;
	}
		
	if (useTimeout == false) {
		var menu = document.getElementById(menuID);
		menu.className = 'subMenu subMenuHidden';
	} else {
		var timeout = window.setTimeout("hideMenu('"+menuID+"', false)", 700);
		menuTimeouts[menuID] = timeout;
	}
}

function isdefined(object, variable)
{
	return (typeof(eval(object)[variable]) != 'undefined');
}