Very cool gallery tutorial

hi everyone i found a really nice tutorial for a gallery but it is not very easy to change anything… could anyone help me? the link to the tutorial is:

http://www.computerarts.co.uk/tutorials/new_media/create_3d_effects_and_add_parallax_scrolling

its very cool but i wanted to add more little image frames so i want to be able to scroll more left and more to the right adding more frames with pictures in them. I am alittle stuck in doing these cause my knowledge of as3 is not that advanced.

if anyone could help it would be great thank you.