function showMenu(id, show)
{
	var obj = document.getElementById(id);
	if (obj){
		if (show){
			obj.style.visibility = 'visible';
		}else {
			obj.style.visibility = 'hidden';
		}
	}

}

var addAnEvent;
if (document.addEventListener) {
 addAnEvent = function(element, type, handler) {
  element.addEventListener(type, handler, false);
 };
} else if (document.attachEvent) {
 addAnEvent = function(element, type, handler) {
  element.attachEvent("on" + type, handler);
 };
} else {
 addAnEvent = function(element, type, handler) {
  element["on" + type] = handler;
 };
}

function mostrar_menu_cursos() { showMenu ('cursosSub', true); }
function ocultar_menu_cursos() { showMenu ('cursosSub', false); }

var menuLoaded = false;

function menuLoad ()
{
	if (menuLoaded)
		return;
		
	var menu = document.getElementById('menu');
	var tags = menu.getElementsByTagName('li');
	var cursosTag = null;
	for (i = 0; i < tags.length; i++) { 
		if (tags[i].getAttribute('class') == 'cursos' || tags[i].getAttribute('class') == 'cursos sel' || tags[i].getAttribute('className') == 'cursos' || tags[i].getAttribute('className') == 'cursos sel'){
			cursosTag = tags[i];
			break;
		}
	}
	if (cursosTag) {
		addAnEvent (cursosTag, 'mouseover', mostrar_menu_cursos);
		addAnEvent (cursosTag, 'mouseout', ocultar_menu_cursos);
		
	}
	else
		alert ('no cursosTag');
	menuLoaded = true;
}

// Abrir ventana popup
function abrirPopup(url, nombre, ancho, alto, extras) 
{
  if(screen.width)
  {
  	var winl = (screen.width-ancho)/2;
	  var wint = (screen.height-alto)/2;
  }
  else{
  	winl = 0;wint =0;
  }

  if (winl < 0)
  	winl = 0;

  if (wint < 0)
  	wint = 0;

  var settings = 'height=' + alto + ',';
  settings += 'width=' + ancho + ',';
  settings += 'top=' + wint + ',';
  settings += 'left=' + winl + ',';
  settings += extras;
  win = window.open(url, nombre, settings);
  win.window.focus();
}


addAnEvent(window, "load", menuLoad);