Redirection in PHP ? (newbie)

Hi, this might be a trivial question but I could not find any docs on that on php.net. I am develloping the admin side of a dynamic web site (php/mysql). The mechanic is nothing special: a form is submitted and sends the data to the php page/script that actually does the work of feeding the db. I noticed that hitting "back" on the browser make the feeding scripts run again, and double the entries in the db. Of course, that is what the scripts are supposed to do :-). To avoid spamming my db I would like to implement a simple redirection function, that would redirect the user to the main admin page once the feeding script has successfully executed and would reduce chances of double entries. Is there a simple way to achieve that ? thanks, Nicolas.