// Validacion de forma
function validar_contacto(form)
{
  if (form.nombre.value == "")
  { alert("PLEASE WRITE YOUR NAME"); form.nombre.focus(); return; }
  
  if (form.correo.value == "")
  { alert("PLEASE WRITE YOUR EMAIL"); form.correo.focus(); return; }

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

  if (form.correo.value.indexOf('@', 0) == -1 ||
     form.correo.value.indexOf('.', 0) == -1)
	{ alert("THE EMAIL IS NOT VALID"); form.correo.focus(); return; }
  form.submit();
}