Javascript Load on Button Click Script Required

I want a code written for a small use preferably Javascript. There are three buttons on my website. They link to each respective video. I want a Javascript/AJAX/Jquery code which shows one video by default and loads the other two videos on click of each respective button. The page should not reload. Only the button should be able to change the video when clicked. The visitor should be able to freely change the videos by click of a button. I have the embed code for video. The embed code should be generalized to work with youtube,evplayer,flowplayer etc. Further clarifications on the PMB.