Hide Firefox Scrollbar (but still able to scroll)

Mostly we think this CSS code will hide scrollbar:

body {
	overflow : hidden;
}

We know CSS code above successfully hide Firefox scrollbar but also disable mouse wheel scroll ability.
But, we could make JavaScript to recognize scrolling event and transform it into page scrolling by using scrollTo() object.

I try to write simple JavaScript codes for you to follow:
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IE6 Bottom Fixed Position, No Jittering

After working on some code samples from the web, I found this code working on Windows XP IE6, without jittering/jumping effect.

But the code i found lack of CSS class selector. So i decide to modify it to support class attribute, for example:

<body>
	<div class="bottom">Footer 1</div>
	<div class="bottom">Footer 2</div>
</body>

So here’s the CSS code with minor edit (this.offsetHeight)
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