document is an alias name?
<p>Is document an alias of Sys.UI.DomElement in JavaScript? 
I have come across <a href="http://msdn.microsoft.com/en-us/library/bb397706%28v=vs.90%29.aspx" rel="nofollow">this example in msdn</a>.  </p>

<pre><code>$addHandler(Sys.UI.DomElement.getElementById("Button1"), "click", toggleCssClassMethod);
</code></pre>

<p>I used to see only <code>document.getElementById(id)</code>. So raised this question.Itmight be sound bad. But I am just kid in JS world.</p>
