how to add more functions to window.onunload?
<p>suppose I have some javascript which says:</p>

<pre><code>window.onunload=some_jsfunction();
</code></pre>

<p>how can I add another function to this handler? something like this:</p>

<pre><code>window.onunload=some_jsfunction() + another_jsfunction();
</code></pre>
