function enter() {
 if (document.webform.iwebnick.value == '') {
  alert("Debes rellenar tu identificativo");
  document.webform.iwebnick.focus();
  return;
 }
 if(document.webform.iwebpwd2.value == '') {
  alert("Debes rellenar tu clave");
  document.webform.iwebpwd2.focus();
  return;
 }
document.webform.iwebpwd.value = hex_sha1(document.webform.iwebpwd2.value);
document.webform.iwebpwd2.value = "";
document.webform.submit();
}