title: ontimeupdate with YouTube API
body: <p>HTML5 video supports the <code>ontimeupdate</code> event; is there an equivalent in the YouTube API that either isn't listed in the docs, or just that I'm unaware of? I've tried a setInterval method to check every n milliseconds, but then I have to check to see if the video is playing, etc. Has anyone dealt with this issue?</p>