How to disable button when checkbox is checked. vbscript?

What is the HTML checkbox convention to mean "either true or false"?

I'm designing a UI where the HTML checkbox is not used for input, but for selecting whether some criteria are selected or not. Therefore, the checkbox could be checked for true, or unchecked for false. However, I'd like an option "for either true or false" or "don't care." With standard HTML, I belive the only way to do this to enable/disable the checkbox using another checkbox, Is it feasible to use a single checkbox to have the 3 options?
Answer:

Maybe you could use a tri-state checkbox. For example see http://shamsmi.blogspot.com/2008/12/tri-state-checkbox-using-javascript.html.

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Other answers

:D As you say check boxes are designed for conditional true or false.. to get more options you can use drop downs or you can design your own widget with JavaScript...

Manoj Hl

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