Automount an image

[Superpoo]

I want to do the following and I don't have the knowleage to do it, so if someone could help me I would be very greatfull.

The thing is that I'm making an autorun menu, and from a button I need to run a file (something like a .bat) to automaticly mount an image that is in the same cd/dvd (so the letter of the unit will change from pc to pc, and that's my problem, I don't know how to put a relative dir). So bassicly I want to automaticly mount an image from the same dvd, only running a file, and (if it's possible) to run a file that is inside that image

Thanks!