Fortunately, you have an older style frame (not compact geometry/ sloping toptube) and an older suspension fork. A "normal" rigid fork should work. It won't need to be "suspension corrected". Check you steerer tube diameter. It looks like 1" But double check. You could either go threadless (if you can find them) or with a threaded fork. In which case you will need to know the length of the steerer.
http://www.bikeparts.com/search_resu...p?ID=BPC133846
These are often out of stock.
Ebay is often a good source as well.