Free order - payment not necessary option not show in IE

In IE payment methods are not replaced with Free order payment method. I got an error in uc_free_order.js line 29:

var uc_free_order_next_method = $(':radio[name="panes[payment][payment_method]"]:enabled:first').val();

to fix it I've changed this line to:

var uc_free_order_next_method = $('input:radio[name="panes[payment][payment_method]"]:enabled:first').val();

and it works fine.