Mine

<form method="post" action="?page=poll.cast"><input type="radio" class="CHECK" value="<?= $item->poll_item_id ?>" name="poll" onclick="this.form.castvote.disabled=false;"/><?= $items->polls__items ?><br /><center><input type="submit" disabled value="Submit" class="button" name="castvote" /></center></form>