need imagemagick script made

ok, so i have all these pics on my server. I upload new ones every day via ftp. I need a way using image magick or something similar that can automatically edit the pics without changing the file names (because my data feed file publishes them on my other site and the pic url's need to stay the same). They are pictures of cars and i need to append them with another image on the top and bottom that has my dealer info, etc. I can provide the image for that. i would really like it if this can occur automatically upon upload to my server. I would also like the option to select from different images (templates). I would also need to script to support other domains on my server if i add them because when craigslist starts to ghost i need to change my image locations of the cars. Please advise me as to the time frame for this. I need it in less than 7 days. Sooner the better. If you have any questions or need to clarify anything please let me know.