Mouse Wheel Listener Blocks Scrolling

Jun 1, 2011

Code:
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<img width=100 height=9000>
<script>
document.onmousewheel = function()
{
[Code]...

First of all, my code only needs to be compatible with IE8 (it's for a limited group of people). My code is intended to detect the rotation direction of the mouse wheel. It fortunately accomplishes that task perfectly fine. But unfortunately it also blocks the mouse wheel default behavior, which is not my intention. How should I change the code so it does not block normal scrolling of the page with the mouse wheel?

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