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<select name="something">
<option value="1">1</option>
<option value="2" onclick="Element.show('otheranswer')">2</option>
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<div id="otheranswer" style="display:none"> Some more HTML here </div>
Of course, I've made use of the Prototype framework (http://www.prototypejs.org) but it's pretty simple to learn and easy to use! Hope this helps.