Just a quick question - is it possible to set the width of an embedded video to auto, so that it just fits the space available?

I'd like to show smaller versions of the videos as thumbnails in a Category Blog view, but then have it show at full size on the article page. If I put a fixed width in pixels in the {youtube} parameters, then it's either too big or too small.

I tried just using |auto but the generated HTML then gives the width as "autopx", which is obviously invalid. Be grateful for any pointers.

Ideally, I'd like to be able set an max-width too, so that it automatically sizes to fit, up to a maximum value.