image1 = new Image();
    image1.src = "/images/tabs/paginaprincipal_off.gif";
    image1on = new Image();
    image1on.src = "/images/tabs/paginaprincipal_on.gif";
    image1stay = new Image();
    image1stay.src = "/images/tabs/paginaprincipal_on.gif";

    image2 = new Image();
    image2.src = "/images/tabs/catalogo_off.gif";
    image2on = new Image();
    image2on.src = "/images/tabs/catalogo_on.gif";
    image2stay = new Image();
    image2stay.src = "/images/tabs/catalogo_on.gif";

    image3 = new Image();
    image3.src = "/images/tabs/novedades_off.gif";
    image3on = new Image();
    image3on.src = "/images/tabs/novedades_on.gif";
    image3stay = new Image();
    image3stay.src = "/images/tabs/novedades_on.gif";

    image4 = new Image();
    image4.src = "/images/tabs/sucuenta_off.gif";
    image4on = new Image();
    image4on.src = "/images/tabs/sucuenta_on.gif";
    image4stay = new Image();
    image4stay.src = "/images/tabs/sucuenta_on.gif";

    image5 = new Image();
    image5.src = "/images/tabs/dondecomprar_off.gif";
    image5on = new Image();
    image5on.src = "/images/tabs/dondecomprar_on.gif";
    image5stay = new Image();
    image5stay.src = "/images/tabs/dondecomprar_on.gif";

    image6 = new Image();
    image6.src = "/images/tabs/docentes_off.gif";
    image6on = new Image();
    image6on.src = "/images/tabs/docentes_on.gif";
    image6stay = new Image();
    image6stay.src = "/images/tabs/docentes_on.gif";

    image7 = new Image();
    image7.src = "/images/tabs/institucional_off.gif";
    image7on = new Image();
    image7on.src = "/images/tabs/institucional_on.gif";
    image7stay = new Image();
    image7stay.src = "/images/tabs/institucional_on.gif";

    image8 = new Image();
    image8.src = "/images/tabs/infantil_off.gif";
    image8on = new Image();
    image8on.src = "/images/tabs/infantil_on.gif";
    image8stay = new Image();
    image8stay.src = "/images/tabs/infantil_on.gif";

    image9 = new Image();
    image9.src = "/images/tabs/tuproyecto_off.gif";
    image9on = new Image();
    image9on.src = "/images/tabs/tuproyecto_on.gif";
    image9stay = new Image();
    image9stay.src = "/images/tabs/tuproyecto_on.gif";

    image10 = new Image();
    image10.src = "/images/tabs/top_off.gif";
    image10on = new Image();
    image10on.src = "/images/tabs/top_on.gif";
    image10stay = new Image();
    image10stay.src = "/images/tabs/top_on.gif";
    
    imageStay = "";

    function imageon(name){
      if (imageStay != name){
        document[name].src = eval(name + "on.src");
      }
    }
    function imageoff(name){
      if (imageStay != name){
        document[name].src = eval(name + ".src");
      }
    }
    function on(name){
      if (check == true){
        imageon(name);
      }
    }
    function off(name){
      if (check == true){
        imageoff(name);
      }
    }

    function stay(name){
      if (check == true){
        document[name].src = eval(name + "stay.src");
          if (imageStay != name){
            if (imageStay != ""){
              document[imageStay].src = eval(imageStay + ".src");
            }
          }
        imageStay = name
      }
    }
    // -->