AJAX File Upload

I have spent the majority of the day learning how to upload files from our web pages. I could not have done it without the wealth of information I found here (especially post's by Aaron Bartell). At any rate, the upload is now working and I am a happy camper. However..........I would really like to make this function with AJAX. I have two forms on my page - one with the normal CGI data and one specifically for the file upload. I have Googled around and got lots of hits - but most seem to point to a specific solution and don't tell me HOW it is done.

So......can anyone shed some light on the subject for me? Point me to some examples? Tell me if it is even doable?

Thanks in advance for any and all replies!

Joe