why is id 'undefined' in this code?
<p>Take the following js, the alert fires, but id is 'undefined'.  Can someone tell me why?  How can I invoke LoadPage with a parameter?</p>

<pre><code>var arr = [];
arr.push(LoadPage);
arr[0].call(5);

function LoadPage(id) {
    alert(id);
}
</code></pre>
