A bit more work on the video previews.

The weirdness caused by a combination of onmouseovers, image callbacks and intervals (is the user still hovering when the image callback triggers?) has been fixed.

We’re also now pre-loading lower quality preview thumbnails onload for instant playback, then switching in the higher quality thumbnails (when loaded) while the preview is playing.

A 2G Connection - starting a video preview at lower quality then switching to higher as it loads