I don't think it will work if you just put the file in the directory. You have to call the asp page somehow. Did it work for you by just putting it in the folder?
I think you should be able to change the image tag without changing the page from html to asp. The getphoto.asp page will do the processing and since it's not an include file, keeping it html should work. *I think.* Give it a try first with one page. Just make sure all your images are in the right directory and your getphoto.asp file points to that directory. Let us know how it turns out.