Single Photo Upload/rename help needed

I hope there might be a simple solution to this issue-

I have a flash web page I’m building and I want to know if there is an application out there that will allow me to do this-

From a browser, using form fields, I want to be able to upload an image, and then fill out a couple of text fields. When you press submit, the photos and text files are saved and renamed as specific file names. When you upload another photo- it overwrites the original. (if the photo can be resized and renamed by the processing application- even better!)

The photo and text files will then be dynamically loaded into to my flash pages.

In other words, I want to be able to log in to a standard html page where I can upload a photo, write up a description, and have the results appear on the flash site I built.

The dynamic loading of text and photos in Flash is not where I’m having trouble- it’s finding a way to upload a photo and text.

Pointing me in the right direction would be greatly appreciated- either through the proper script or tutorials or if there is an AJAX application (I only recently heard of AJAX- still don’t have a grasp of what it’s about…yet) out there I could learn about.

This will be a “Daily Specials” page that shows a vehicle for sale with description and pricing. I don’t want to have to be the one constantly maintaining it when I’m quite sure there is an application or script out there I could be learning how to use.

Thanks in advance!