/* Validacion de formulario */

function Validar(form)
{
  if (form.nombre.value == "")
  { alert("PLEASE WRITE YOUR NAME"); form.nombre.focus(); return; }

  if (form.email.value == "")
  { alert("PLEASE WRITE YOUR E-MAIL"); form.email.focus(); return; }

   if (form.comentario.value == "")
  { alert("PLEASE WRITE YOUR MESSAGE"); form.comentario.focus(); return; }

   if (form.email.value.indexOf('@', 0) == -1 ||
      form.email.value.indexOf('.', 0) == -1)
  { alert("THIS IS NOT A VALID E-MAIL"); form.email.focus(); return; }
  form.submit();
}