Finalizing PAL to NTSC

[pyrotchnx]

I have eleven PAL Tin-Tin DVDs from a friend and he wants me to convert them to NTSC and wants to keep all the menu's. I did some reading and found that numenu4u would do just that, once doing that I converted the main video files with avi2dvd. Now I'm stuck with the problem of trying to merge the two (the menu and main video files), I've done some searching and reading but can't seem to find that answer. Does any1 know of a thread or how to explain how to finalize this painful process?

thanks.