The page displays OK in Firefox, but not in MSIE.
This leads me to think that the following is the problem...
Open this file for editing:
includes/templates/template_default/common/tpl_header.php
and find the following two lines (near line 60 - 65)
HTML Code:
<div class="clearBoth"></div>
<!--eof-navigation display-->
COMMENT out the div clear both line - like this...
HTML Code:
<!-- EDIT BEGIN <div class="clearBoth"></div> EDIT END -->
<!--eof-navigation display-->
Save the edited file to:
includes/templates/yeom/common/
NB: if you already have an override of this file, edit the override and put it back in the proper yeom folder.