Can someone supply me with a simple perl script for uploading a file via a browser from the client PC to a local directory of the server.

I echo Velaki's suggestion in that there are plenty of ready-made examples available, but I must advise you to avoid Matt's Script Archive, otherwise known as MSA. Matt has admitted to producing inferior, insecure, and downright buggy code. A good place to start may be the NMS archive, which provides higher quality CGI scripts.