Validation might be the first step to take, in IE your header is huuuuge.

I don't understand tables in general.....

You should switch so the whole layout is css... it gives alot more flexebility.

I can't see what specifically is causing it... but you need to avoid little mistakes like this

Code: Select all

 
<table align="center" bgcolor="#ffffff" border="0" cellpadding="0" cellspacing="0" width="100%">
<tbody>
          <tr>
  
<tbody>
  <tr>
                <title></title>
                <script type="text/javascript" src="dropdowntabfiles/dropdowntabs.js">

</script>

The title should be called in the head, i think it is... as well..

Theres a few little mistakes like that...

Validation (Failed validation, 34 Errors)

From experience i've noticed that fixing validation errors solves roughly about half of all my problems.