How to run these functions one after the other?

Question

How can I have these functions run one after the other, so each one finished before the next starts?

        $(window).unbind();

        $('.buyersseclink').removeClass('buyersseclinkon');

        $(this).parent().delay(900).addClass('buyersseclinkon');

        $(window).bind('scroll', function () { 
            $('.buyersseclink').removeClass('buyersseclinkon');
        });

Thanks