>>>How can I change tabs in IE7 programmatically?
>>
>>Dirty unreliable solution would be to use SendKeys().
>
>I thought of that, but unless I know which tab is active, I don't know how many tabs to scroll.

Did you research automation object? May be it does offer some method to switch tabs?

With JavaScript you can do this, BTW

http://www.stilbuero.de/2006/05/13/accessible-unobtrusive-javascript-tabs-with-jquery/