Cross browser JavaScript (not jQuery...) scroll to top animation
<p>I'm looking for a simple, cross-browser "scroll to top" animation I can apply to a link. I don't want to require a JS library such as jQuery/Moo, etc.</p>

<pre><code>// jQuery Equivilant to convert to pure JS...
$('html, body').animate({scrollTop:0}, 400);
</code></pre>

<p>I'm a perfect case for someone who should have learned JS 100% before jumping into a library. :(</p>
