if($typeids[$i]['id'] == $refObj->TypeLink->TypeInfos['id']){$pv->Fields['currentstyle'] = ' class="m_hover"';}else{$pv->Fields['currentstyle'] = '';}

<ul class="ky7">{dede:channelartlist type='son' noself='yes' typeid='2'}<li><a href="{dede:field name='typeurl'/}" {dede:field name='currentstyle'/}>{dede:field name='typename'/}</a></li>{/dede:channelartlist}</ul>