Forum Moderators: open
<iframe name="video-player" id="video-player" src="video-placeholder.html"></iframe>
You can do it directly, creating a video player file for each video:
<a href="video1.html" target="video-player">Video 1</a>
Or if you use a script that outputs the video based on a parameter,
<a href="video.php?v=1234" target="video-player">Video 1234</a>
You can also do this using Javascript, but it's probably not required (and breaks if JS is disabled.)