How to generate a pop-up window if a user is not logged in?
<p>In an HTML page:</p>

<pre><code>&lt;a href="/files/getfile.php?name=abc.zip"&gt;file download&lt;/a&gt;
</code></pre>

<p>in PHP script(getfile.php):</p>

<pre><code>if('notlogged')
{
  echo 'please, loggin~'; //pop up, possible?
  return false;
}
</code></pre>

<p>So my question is, When user click the anchor tag, can I pop up a login window if user didn't log?</p>

<p>I knew I can pre-check in Javascript before calling the PHP script whether user logged or not.</p>

<p>But, it's not my case for use; the PHP script should have to throw pop up code.</p>

<p>The page user is viewing should not changed — just pop up login window.</p>
