Is there anyway to change your cursor within forums?

I want the cursor to be Windows Aero Cursor, How do I do that?

Edit: ok I got it

<style type="text/css">
<!--
body {cursor: url('http://svr1.cursorhost.com/020908/1220311149d6qtxs.cur');}
-->
</style>

But why doesn't it work in FireFox, but it works in Internet Explorer?