when painting cars with the doors closed 3M makes a foam mask to keep the over spray out of the jambs and not leave a hard tape line.
http://www.bizrate.com/rd2?t=http%3A%2F%...3B2%3Bmain%3B1.
it works great. if you are spraying sealer it will leave a sealer line in the jamb so be careful.
they also make a special tape to stop sealer lines. if someone needs the number i will call the paint store for it.

perception is 90% of reality