Why is DOMWindow not defined when the constructor of 'this' is DOMWindow
<p>I'm trying to find DOMWindow but it keeps saying it's undefined. How do I get it?</p>

<pre><code>(function() {
    alert(this.constructor); // function DOMWindow() { [native code] }
    alert(DOMWindow); // DOMWindow is undefiend
})();
</code></pre>

<p>What's wrong here??</p>
