Detecting "ended" event in Blackberry website after playing video

We develop a video website开发者_StackOverflow for blackberry. When the user click in a video thumb we redirect him to the video file and the native video player is launched. When the video completes or the user press the Back button it come backs to the site. Its there any way to detect when the video has finished? or maybe when the user goes back to the page?

FYI: we cannot use html5!

Thanks

Listen for blur and focus events on the window itself.