Ah, ok, finally found the problem. Inside the HTML for your tab UL:
Code:
<ul id="maintab" class="shadetabs">
<li class="selected"><a href="#" rel="Core"><img src="test2_files/srvc-tabs-core-services-up.gif" alt="Core Services" name="coreservices" border="0" height="29" width="146"></a></li><li class=""><a href="#" rel="Tours"><img src="test2_files/srvc-tabs-special-tours-up.gif" alt="Special Tours" name="specialtours" border="0" height="29" width="144"></a></li><li class=""><a href="#" rel="Transportation"><img src="test2_files/srvc-tabs-transportation-up.gif" alt="Transportation" name="transportation" border="0" height="29" width="163"></a></li><li class=""><a href="#" rel="Trips"><img src="test2_files/srvc-tabs-trips-getaways-up.gif" alt="Trips and Getaways" name="tripsgetaways" border="0" height="29" width="170"></a></li><li class=""><a href="#" rel="Events"><img src="test2_files/srvc-tabs-events-up.gif" alt="Events" name="events" border="0" height="29" width="94"></a></li>
</ul>
Remove the code in red. Basically in these two cases you have a name attribute with the same value as the corresponding rel attribute within the same tag (well, the <a> associated with the image anyway). This is causing IE to think that the tab is part of the tab content to contract/ extract. In fact, ideally, you should just remove the name attribute from all links above to avoid a clash from occuring again.
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