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Not sure there is a way. you can always select the layer & copy it then create a new document & it should automatically generate proper w&h. if you dont need exact, you can always turn on rulers &...

You can style them the same as any other css bgr element but in my experience the cross browser compatibility is suspect. try this:

<input type="radio" name="radioname" class="bgr">
//
bgr...

I would validate your code first then test the onload event.