Duplicate records saved on Click of save button

[eluser]Unknown[/eluser]
I am using php and mysql database, my problem is that in my page there is two field first is title and second is upload photo. its working perfectly, But when i press f5, then same entry saved in again.I refresh the page or press f5 then entry is saving in database and even seen in grid. so how to prevent my page to save the record again until and unless i press on save button.

thanks in advance