Here's help to replace a tumble dryer belt?

Check this webpage:
http://repair2000.com/dryer.html
At page bottom, the option "How to change a dryer belt" led to this link:
http://repair2000.com/wpoolbelt.htm

The instructions with pictures were for Whirlpool/Kenmore/Roper/Kitchenaid dryers, but they may be sufficiently similar to yours to help.

We were able to change the belt on our dryer in a couple of hours with the help of these instructions. Cost: $8 for the belt.

This site might also help: http://www.repairclinic.com/0047_8.asp
It helped me to determine the part we needed, based on the dryer's serial number. It also has some basic repair info.