http://poselab.com/en/jquery-tabs-with-animations-shadows-and-rounded-corners/

I liked how the tabs function in the example below. In the example it has a slideup and slide down to show and hide the content. I would like to get that animations replaced with reqular hide and show content. 

it seems to be straight forward but I can't seem to make it work without ruining the css. 

Please advise

Thanks