i could be late on this, or there could be other ways of doing this, but check out this program. xingtone. you can edit any mp3 you have to be your ringtone. they have a free trial where you can make 1, then its $20 to buy the program and make unlimited. i may buy it with my upcoming xmas cash. this shit is awesome.

unless someone knows of a free program or way of doing this?

http://www.xingtone.com/index.htm