Welcome to WebmasterWorld Guest from 18.104.22.168
I used to do this in ASP using a response.redirect. I guess there is an equivallent in PHP?
You can also use PHP to output data types other than HTML, so it would be quite possible to store the image data any place you like (such as a database) and send it to the user from a php script without a redirect.
What purpose does this serve that linking the image from the other domain directly doesn't?