radio buttons "checked" does not validate

The checked state of the radio buttons in the following script does not validate..?
the selection does change however.
any advice? (both -checked=”ckecked”- and -checked by it self- do not work.)

<form method=post name=’ChangeCurrencyForm’>
{literal}
<script language=’JavaScript’>
function _changeCurrency()
{document.ChangeCurrencyForm.submit();}
</script>
{/literal}
<table>
<td><input name=”current_currency” onclick=”JavaScript:_changeCurrency()” value=”1″ checked=”ckecked” type=”radio”></td>
<td><input name=”current_currency” onclick=”JavaScript:_changeCurrency()” value=”2″ type=”radio”></td>
<td><input name=”current_currency” onclick=”JavaScript:_changeCurrency()” value=”3″ type=”radio”></td>
</table>
</form>

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