Renaming a file uploaded by a form.

I have a script that uploads form data to a MySQL server then emails the form data to alert people that an upload occurred. I am having trouble getting the form to upload my file with the actual filename. The filename seems to be created by the PHP machine (wild guess) but it looks like this: /var/tmp//phptkYxkV Any ideas on how to get it to look like: filename.doc would be greatly appreciated. /Tim