use
Code:
{foreach from=$v.options item=o}
<input id="po{$v.classid}" type="radio" name="{$poname}" value="{$o.optionid}" {if $nojs ne 'Y'} onclick="javascript: check_options();"{/if}/>{$o.option_name}
<br />
{/foreach}
to include the javascript for updating the price and image and what not