// Precarga de imagenes para menus desplegable

    if (document.images)
    {
      preload_image_object = new Image();
      // set image url
      image_url = new Array();
      image_url[0] = "http://www.telmex.com/mx/images/images_css/menu_3.png";
      image_url[1] = "http://www.telmex.com/mx/images/images_css/menu_base02b.gif";
      image_url[2] = "http://www.telmex.com/mx/images/images_css/menu_0b.gif";
      image_url[3] = "http://www.telmex.com/mx/images/images_css/menu_3b.png";
	  image_url[4] = "http://www.telmex.com/mx/images/images_css/menu_base02.gif";
      image_url[5] = "http://www.telmex.com/mx/images/images_css/menu_base01.gif";
	  image_url[6] = "http://www.telmex.com/mx/images/images_css/menu_00.gif";

       var i = 0;
       for(i=0; i<=6; i++) 
         preload_image_object.src = image_url[i];
    }