hey all, ive googled this and searched here and havent found what im looking to do...dont know EXACTLY what im going to do with it as of yet but i have ideas...

what im looking to do is make it so ANY time a visitor views my site, the index page is different...ie-you click on my site and refresh 1,000,000 times you get 1,000,000 different pages (over exageration of course but you get the idea)...and this includes google bot ...any time the bot shows up to index.php its got something different to index...is this doable or am i over-dreaming?

Thanks