Customize Flash php Script

I have a working Flash script. Need the "logo" image updated with an image I will provide. Change some text and remove a couple of buttons. Simple stuff. The harder work is the script is designed to let users make 2" x 3" business cards and I'd like to change the size to support 2" x 6" and 4" x 6" layouts. There is a "grid" button that overlays lines and if possible, I'd like to change this from a grid to squares...but I don't know if that's even possible. My use case is a photobooth and I need a way for users to do the layout. All of the functions of the script are ok. I just need it working for a little larger format.