Access iQuery Tabs directly with a link

Hi folks!

Right now I’m working on a page on witch I’d like to use tabs. Here is a test-page with the theme I’m using: http://www.sfglab.bruggebrain.com

My problem: I’d like to link directly to, lets say, tab 3.

There is one Javascript and one PHP file responsible for tabs
– http://sfglab.bruggebrain.com/downloads/shortcodes.txt (original:php)
– http://sfglab.bruggebrain.com/wp-content/themes/engo/files/js/script.js?ver=1.0

Any idea what I can add to those files, to have the third tab open by navigating to http://sfglab.bruggebrain.com/?tab=3 for example.

As I’m a desperate non-pro in those things I’d really appreciate your help.
Many thanks!
Christoph