refresh Browser

Hi! a general php-question! do I have to care about the web-browser reloading a php-page automatically and not taking a cached one! For example submit.php (the conent changes every second!): <html><body> <? if (isset($x) and ($x=="A")) echo time();?> <p><a href="submit.php?x=A">CLICK</a></p> </body></html> what do I have to do, to guarentee that the client has got the actual page? - or does the browser know - ordering a .php page means "really fetch it, and don't take the cached one! but what about proxy-server out there??? thanks for any hint witty -- Sent through GMX FreeMail - http://www.gmx.net