Sliding menu? Please help!

Hi Everyone,

I’m working on a sliding menu where the content slides to place when you click the button.
All my movieclips are named content 1-9 and the buttons b 1-9. It works perfect until the movieclip (contentHold) that contains all my movieclips (content 1-9) gets too wide for some reason. I made a real easy version that you can download. The contentHold mc is a lot wider than my workspace. Does anyone know why it works as long as I can fill in the coordinates, because when it gets too wide and I trie to fill in the coordinates Flash says: Invalid number?

PLease any help is welcome. I’ve also attached a simplified version as Flash CS3 file

Greetings Ronny