I was going over the button demos at http://jqueryui.com/demos/button/ in IE6, IE8, FF2, FF3 and Chrome 4 and discovered that the anchors, radios and checkboxes are broken in FF2. I had assumed it was the theme and/or the page itself but the issue is still present when I change themes and tested it on my own page.
I've updated this post to include a much simpler example.
Problem:
The pageX and pageY properties of the mouse event is incorrect for elements inside a <div> which is inside a <td>, but ONLY when the <div> has its css position property set to "absolute", "relative", or "fixed".
This is while using jquery 1.4.2.
<html>
<head></head>
<body>
<table>
<tr>
<td width="100">stuff</td>
<td>
<!-- if style is removed from this div, the problem goes away -->
<div id="tabs2" style="position:relative">
<a href="#" id="trigger">Trigger 1</a> <!-- trigger for popup -->