Three tips for you:

1) Add comments to your code.

2) Don't attempt to write your entire program in one go, write it in small pieces, debug that part, then add the next part.

3) Don't use interrupts unless there's a definite need to, it makes your program more complicated, and FAR more difficult to debug.

__________________
PIC programmer software, and PIC Tutorials at:
http://www.winpicprog.co.uk