Since u aint on msn i thought id just say here, well i created a little example bit of what i ment. Its a basic way of calcuating reletive object positions + some collison detection, its a little strange with some of its behavior though, but i was really just playing around.
http://img503.imageshack.us/my.php?image=relmovqm7.swf
(u control red car, arrows move it, its freeform with no barriers so u can drive forever, it just wont have much scenery to look at if you do.
Viper, poke me on msn if u want the fla :p