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querying Radio buttons


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I am having trouble finding where the attributes for getElementById are located

	<input id='opt' type='radio' name='kind' value='O'>Options
	<input id='stk' type='radio' name='kind' value='S'>Stocks

How in js do I determine which one of these was chosen?  getElementById('stk').value doesn't seem to work  when going after the one not chosen.

I seem to think there might be "selected" attribute but I can't find it documented anywhere.


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