I wrote a VB application to do the same thing, once. Now that I'm using a Macintosh upstairs, I'm wishing for a cross platform solution, so when you finish your PHP project, let us all know, because I'm sure some of us would like to use it.

Within this thread is the information I used (based on conversations with Roger) to write the application. This is what you're looking for:
http://empegbbs.com/ubbthreads/showflat.php/Cat/0/Number/181786/an//page//vc/1