if (!document.getElementById)
    document.getElementById = function() { return null; }

function MenuOcultaMenu() {
    var a, i;
    a = document.getElementsByTagName("ul");
    for (i=0; i<a.length; i++) {
        if (a[i].className == "MenuNivel2")
            a[i].style.display = "none";
    }
}

function MenuDespliega(activa){
  var menu = document.getElementById(activa);
    if(menu.style.display == "none"){
		MenuOcultaMenu();		
      menu.style.display = "block";

    }
    else{
      menu.style.display = "none";
	  
    }
}

window.onload = function() {
	MenuOcultaMenu();
}

function despliega2(activa2){
  var menu = document.getElementById(activa2);
    if(menu.style.display == "none"){
			MenuOcultaMenu();	
			ocultanivel1();
      menu.style.display = "block";	  	
    }else{
      menu.style.display = "none";
    }
}

function ocultanivel1() {
    var a, i;
    a = document.getElementsByTagName("ul");
    for (i=0; i<a.length; i++) {
        if (a[i].className.indexOf("MenuNivel1")>-1)
            a[i].style.display = "none";
    }
}