Page refresh and database updation

Hi All, I am a PHP newbie. I am using HTTP POST request to send some data to Apache and then using MySql to store that information. Once information is stored in MySql DB successfully, I display a result page. But the problem I am facing is that, if I refresh the result page displayed after database updation, the information is stored again in database which I don't want to. Please guide me on how I can avoid duplication of information in database on refreshing the page. Thanks in advance! Regards, Pravin