Disk image control via AppleScript

[macavenger]

This should be a simple one for you guys: I want to make an apple script that mounts a disk image, and then opens an application. However when I try to tell finder to open file, I get an error saying can't get file. I finally got it to work using the do shell script open command, but this seems rather kludgy to me. Also, is there some way to do this so I don't have to specify the full path to the disk image, so I don't have to rewrite the script if I move it? Thanks.

[macavenger]

Ok, maybe this wasn't as simple a question as I thought Anyone have any ideas? Thanks.