Hi,
You did'nt state what type of vehicle it is,
but basically there are 2 types of engine
an interference and a non-interference
interferencr type mean that if the belt snaps the pistons will crash into the valves resulting in quite a very expensive strip-down and rebuild,
a non interference leaves enough clearence between the pistons and the engine top-end so that if the belt breaks it should'nt cause too much damage.
best thing would be to contact a main dealer for your type of vehicle and ask one of their mechainics/service technicians
they will be able to tell yopu strait away.
interference-new engine
non interference-affordable repairs.
hope this helps
Mugajugz Albarota, May 2007