function displaySub(divid)
{
  var e = document.getElementById(divid);
  if (e.style.display == "none"){
    e.style.display = "block"
    e.previous().style.backgroundImage = 'url("images/Menu_Productos_contenedor_clickeado.png")'
  } else {
    e.style.display = "none";
    e.previous().style.backgroundImage = 'url("images/Menu_Productos_contenedor.png")'
  }
}