function changeOrdType ()
{
	frm = document.forms['ord_form'];

	ot = parseInt(frm.elements['ord_type'].options[frm.elements['ord_type'].selectedIndex].value);
	if (ot == 2)
	{
		frm.elements['ord_s4'].disabled= false;
		document.getElementById ('ord_s4_td').className = 'required';
	}
	else
	{
		frm.elements['ord_s4'].disabled = true;
		document.getElementById ('ord_s4_td').className = null;
	}
}