Restrict Page

I'd like to display a random image (it's a security image generated by PHP code with GD...), but I don't want people to be able to reload the page with the same image. In other words, if I proceed to another page, but than hit the "back" button, I don't want the same image. Possible?

Use SQL with $USER_IP = $_SERVER['REMOTE_ADDR'];Write to datatabase which IP see which images and show next in que. In this way you can write to database time() to delete entry. And user can start que from begining. Don't time to write full code, now. But if you wish i can write them.--------------------Practice is when evrything is work but no one know why.Theory is when work nothing but evry one know why.Programmers join Practice with Theory - nothing work and no one know why

Not sure. The browser might attempt to cache the image. You could try a tool called Captcha: https://www.google.com/search?q=captcha

Lemme know if it works or not.

You could most likely do this with some no-cache headers. PHP.net's header page has some examples:

http://forums.xisto.com/no_longer_exists/

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PHP scripts often generate dynamic content that must not be cached by the client browser