Artemyi,
page1:
...<a href="page2.html?id=27697">Заказать</a>
...<a href="page2.html?id=27698">Заказать</a>
page2:
<form name="order">...<form>
<script>
var m = location.search.match(/id=(\d+)/);
if (m) { document.order['data[new][bus]'].value = m[1] }
</script>