Default Category Pages

How do I set the default category page that shows when clicking a category from the widget.

I have the widget on the side showing Wiki Categories, and I have a category called omega. If you click it, it goes right to an article. Instead I want it to go to the head wiki of that category.

http://juicerplanet.com/

On the side you will see

Omega

Click it, then in the breacrumb click its parent. Thats where I want it to go.

Any ideas?

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