This only occurs in IE. It's caused by padding in the IE conditional comment.
<!--[if IE]>
<style type="text/css">
/* place css fixes for all versions of IE in this conditional comment */
.twoColFixLtHdr #sidebar1 { padding-top: 30px; }
.twoColFixLtHdr #mainContent { zoom: 1; }
/* the above proprietary zoom property gives IE the hasLayout it needs to avoid several bugs */
</style>
<![endif]-->
Nancy O.
Alt-Web Design & Publishing
Web | Graphics | Print | Media Specialists
http://alt-web.com/
http://twitter.com/altweb
