Undefined Index: action?

1

I have thus error occuring here:

Undefined index: action in /var/www/thefubaredsite/htdocs/login.php

login.php:



<form name="login" method="POST" action="login.php">
        <p><br>
&nbsp;Username:
          <input type="text" name="user" id="user">
    </p>
        <p>&nbsp;Password:
              <input type="password" name="pass" id="pass">
        </p>
        <p align="right">
          <input type="submit" name="submit" value="submit">
       </p>
      </form>

<?php if($_POST['action']=='submit'){
 $theSentry->checkLogin($_POST['user'],$_POST['pass'],10,'index.php','login.php?action=error');
}
?>

Where $theSentry is a login check I am using from a tutorial online. I have tried defining ‘action’ to no avail, and note this works in php 5.1.2 but not the latest 5.1.4. Does any one have any ideas here? :link: