function billingAddressTypeChange(o)
{
    var new_only = (o.checked && o.value == 'billing');
    $$('.new_only').each(function(input)
    {
        input.disabled = !new_only;
    });
}
function paymentTypeTypeChange(o)
{
    var cc = (o && o.value == 'credit' && o.checked);
    $$('.cc_row').each(function(input)
    {
        if (cc) input.show();
        else input.hide();
    });
    $$('.po_row').each(function(input)
    {
        if (cc) input.hide();
        else input.show();
    });
    
}