Scrolling Content on Kirupa

Hey!

Has anyone used the tutorial on the scrolling content? I used it but for some reason when you click the UP arrow it thinks there is more content at the top of the screen. Does anyone know why that happens?

My mask is only around my movie clip and the movie clip is exactly the size i need it to be.

has anyone else had this similar glitch?

Any help is much appreciated

the file is : http://www.online-redefined.com/diwebsite/