Hi, sorry we weren't able to help.
But to answer your question (as you figured it out) to center AP elements you must know the width and then all is easy (if you want vertical centering then you must know the height)
margin-top:-150px;/*half the heigiht value*/
margin-left:-150px;/*half the width*/
Are you sure you won't reconsider my offer of the iTunes? I wnat songs :(.