First post, 1985 Tercel question

Hey, I am a Toyota newb, go easy on me.... :) I just picked up an 1985 Tercel wagon, 2wd. It has 155/80R13 tires on it, anyone know what the bolt pattern is? I would like to go to a 14", or possibly a 15" rim and tire, if possible. I know it is not pretty, just looking for a bit better handling. Thanks in advance!

http://www.freepichosting.com/Thumbs/421547600/249/1.jpg
http://www.freepichosting.com/Thumbs/421547600/250/1.jpg
http://www.freepichosting.com/Thumbs/421547600/252/1.jpg

Ok, stupid question time.......what do you mean by "bolt pattern?" I recently upgraded to a 14" rim.
BTW, how do you get a picture to appear in a post?

All wheels have a specific designation, for example I found out today that this car has a 4x100 pattern, which I believe means 4 bolts, and 100mm(?). Not sure what the 100mm refers to. As far as the pics go, I use a free pic hosting site, upload my digital pics (after reducing the size of course) and then putting in with the link in between.

as far as i know its 4x100. only the bigger toyota cars like the supra had the 4x140 pattern, again, i'm not an expert, that just comes from personal experience.

Great thanks!!