browser reload button

Hi list, I've made a log to my site, that counts the hits per page. My problem is, there is some way to detect when the user presses the reload button?? I need this, or other suggestion, in order to prevent the log to input data for the reload, that isn't a real visit. My script is just a insert into a table, and I put it in the beggining of my page with require(); Thank's in advance Rodrigo Peres --