[Plugin: Tabber Widget] Only 1st tab can be clicked on

Hi ~
I have 3 tabs, but only the 1st tab can be seen. When I click on the other 2 they don’t show the text I’d inserted into their tabber sections in the widget area.
Any ideas on where I’ve messed up?

http://74.220.219.109/~domestm8/

http://wordpress.org/extend/plugins/tabber-widget/