If I had to guess the problem is due to some of your Tab Content DIVs not being closed properly. IE is very picky about these things. For example, looking at your source:
Code:
<div id="tcontent1" class="tabcontent">
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<span style="font-weight: bold;">Featured Alerts - Registration, Ticket Booking, Submission, Invitation</span>
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<div id="alerts1" class="tabcontent">
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<a href="http://www.delhievents.com/2007/08/theatre-workshop-short-course-on.html">THEATRE WORKSHOP - Short Course on Theatre by Chicago based Pegasus Players at American Center - 17th & 18th August, 2007</a>
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<a href="http://www.delhievents.com/2007/08/theatre-hungry-heart-festival-presents.html">THEATRE : Hungry Heart Festival presents "Laugh Affaire" Two Plays at Hotel Ashok - 17th & 18th August, 2007</a>
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<a href="http://www.delhievents.com/2007/08/mobile-monday-delhi-momo-delhi-4th.html">Mobile Monday Delhi ( Momo Delhi ) 4th Episode at Management Development Institute, Mehrauli Road - 18th August, 2007</a>
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<a href="http://www.delhievents.com/2007/08/children-workshops-says-history-is.html">Children Workshops "Who says History is Boring?" by Devika Rangachari at British Council - 18th August, 2007</a>
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</div>
In the above there's two tab contents, but I only see one closing </div> tag. Check your page to make sure every tab content is closed properly.
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