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example:
<input type='radio' name='test' value='1' />
<input type='radio' name='test' id='nr2' value='2' />
<input type='radio' name='test' value='3' />

$$("input[type=radio][name='test'][value='3']")[0].writeAttribute("checked", "checked");
or
$("nr2").writeAttribute("checked", "checked");

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Tagged: Prototypejs, radiobutton