//Mostrar y Ocultar DIVS
//Autor: Alejandro Ricoy
//Empresa: Infoviews, S.A. de C.V.

function changeDisplay (id) {
      d=document.getElementById("extra");
      e=document.getElementById(id);
      if (e.style.display == 'none' || e.style.display == "") {
        e.style.display = 'block';
        d.innerHTML = 'Ocultar';
      } else {
        e.style.display = 'none';
        d.innerHTML = 'Mostrar';
      }
    }