PHP file caching on the internet

folks, major problem. we're just launching our new portal [www.hoboe.com]. we have about 100 files, about 50 PHP and rest HTML. our INDEX.HTML, homepage, is a frameset containg three files, top.html, middle.php3 and bottom.html, none of the 100 files on our entire website are caching before display EXCEPT MIDDLE.PHP3, which actually is very irritating. why is this happening? is there a no-cache available for this php file? why is it that only this particular php file is caching and none other, php or html? any help will be so utterly remarkably appreciated. regards, T. Edison jr. ===== Rahul S. Johari (Director) ****************************************** Abraxas Technologies Inc. Homepage : http://www.abraxastech.com Email : abraxastech@yahoo.com Tel : 91-4546512/4522124 ******************************************* __________________________________________________ Do You Yahoo!? Yahoo! Messenger - Talk while you surf! It's FREE. http://im.yahoo.com/