function SprawdzFormularzLogowania(forma)
{
   with (forma)
   {
      email.value = trim(email.value);
      haslo.value = trim(haslo.value);
      
      if (email.value == '')
      {
         alert('Your login is needed!');
         return false;
      }
      if (haslo.value == '')
      {
         alert('Your password is needed!');
         return false;
      }
   }
}