Clone of icanhascheezburger.com or at least some of it's functions

I am looking for a script that takes a picture as input and outputs a captioned picture where the caption is typed in by the user. Here is one site that does the captioning: [login to view URL] Here is another one that mainly does it on lolcats: [login to view URL] Basically the script needs to take in a .png or jpg or whatever as input and then allow the user to type text which then gets transposed onto the picture and the final picture becomes available for download.