I love this idea. I did a quick pure-CSS implementation, not bullet-proof by any means - biggest downside is it's reliance on the `required` attribute: http://j

I love this idea. I did a quick pure-CSS implementation, not bullet-proof by any means - biggest downside is it's reliance on the `required` attribute: http://jsfiddle.net/thetron/qpsnH/ http://jsfiddle.net/thetron/qpsnH/