Board Thread:Support Requests - Getting Technical/@comment-4316832-20130212055522

I would like to customize the tabber so that the selected tab has the background of the image url http://images.wikia.com/btd-5/images/0/0a/Tabber_Tab-Selected.png and the other tabs having a background image url http://images.wikia.com/btd-5/images/8/89/Tabber_Tab-Unselected.png. How to do it? 