well jpegs/gif`s etc are of fixed sizes and you can`t just streched them out, especially because that would probably turn into some really bad layouts. Probably the best way is to have 3 versions for the most popular resolutions, 800 x 600, 1280x1024 and 1600 x 1200, and make a php script which determines the users resolution and points him to the proper page. For the other resolutions out there you can just point to the more apropriate resolution. But i don`t know, it might be an easier solution. Looking forward to find out to.
do you know what the php code is to do it??
Whatever size you want really. I believe mine was 750x600 or something like that. Not entirely sure. But as I said, it's up to you. Once you get it all done you just have to splice it all apart then put it back together in HTML.