Loading video in another div (like you tube)

hi folks,
i am creating a website. where i have a big div which has the main video playing and below them are smaller div as image preview of embed video. i want when someone click on that image preview it should play in the main div instead of the smaller ones (as i m using youtube iframe embed option). how can i achieve it?

Use the onclick event to trigger a javascript function to load the content in the main div.