Saving file from image proxy

Image proxy is a web page used to serve images from web sites that stores its images outside of the root directory of the web page. This is done for security purposes. The web image tag looks something like <img src=imageproxy.php?filename=xx.png>

The resultant web page looks exactly like any web pages except when you try to save it. The file name become imageproxy.php instead of xx.png. Any user will complain that this is no user friendly.

I took hint from some Netizens that by using the ALT attribute and put the actual filename as its value solved the issue. It also helps when the image is not available. User will get to save the file with the proper name. It benefits both the programmer and user.