Issue with playing video in a page

Issue with playing video in a page

I have my main page (main.php) which has a thumbnail list. When I click a list item, I go to video.php where I grab an ID and embed the src from a db result. The video plays and works fine. My question is when I hit the back button, the video will continue to play if it hasn't been paused or stopped. What can I do to fix this?