function verifica() {
  if (document.forms[0].login.value.length == 0) {
    alert('You must enter LOGIN!');
    return false;
  }

  if (document.forms[0].pass.value.length == 0) {
    alert('You must enter a PASSWORD!');
    return false;
  }
  
    if (document.forms[0].name.value.length == 0) {
    alert('You must enter a NAME!');
    return false;
  }

  return true;

}