function ValidaForm(objForm)
{
  var ok;
  
  ok = validaCampo("string", objForm.txtUser, "vazio","Preencha o campo Usuário!");
  if(!ok)
    return false;
    
  ok = validaCampo("string", objForm.txtPassword, "vazio","Preencha o campo Senha!");
  if(!ok)
    return false;
	
  objForm.submit();
  return true;
}