Online Photo resizer

I would like a script that is like the one on the link below. with the exception I do not want to give the end user a choice on what size to rezie the photo down to, I want to be able to set the size the photo resizes to automatically. So all they will need to do is brouse to find a photo on their local computer then upload it by hitting the submit button, any size photo such as maybe a 3 meg photo then the script automatically resizes in down to 500 x 375 pixels and then it automatically downloads the photo to their local hard drive and does not save the photo on the server. Try this script and you will see what I want [login to view URL]