Hello everyone. I have just started playing with PNGs and really like them. I have seen a trick used that I am dying to find out and after searching on my own for about a month and a half I have only found out that it can be done and I don't know how.

If you load this picture:
www.kogaclan.com
in your browser you will get a new image everytime you hit "refresh". Yet the address for the image is exactgly the same.

Now I had thought that this is a trick of PNG file, but I see it also works with this JPG file:
www.kogaclan.com

In any case I would like to find out what trick is used to do this. If it is something I need to set up on my web page, or what. I don't think PHP will solve my problem as I have looked into that and requires actual code on a web page made for that graphic. I need it to work like thses images do here. This way I can set the image to be a sig file and set it up to operate on other people's forums.

Any help, or if you can direct me to another forum that you think could help me better is much appreciated. Thanks.

The images are generated via a server side script.

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