You have some weird setting on your directory... as I cant view your image...
If I go here: it will display a random image, and if I press enter on the address bar, it clearly pulls from the cache (as it loads immediately and doesnt have the scroll)
http://www.8wayrun.com/customstyles/...der/header.php
However, if I go to your script: it WONT display an image, instead it will give me a download prompt for your php file... which is something that it should never do.
http://www.wetacollectors.com/forum/...ges/header.php