How could I get the second last elment?

How could I get the second last elment?

Hi,
how could I select a html-element before :last-child?

I have an script like:
  1. var lastelm = $('div.lof-main-item:last-child'),
            buttonnext = $('a.next'),
            buttonprev = $('a.previous');

            $(buttonnext).click(function() {
                if (lastelm.css('opacity') === '1') {
                    $(buttonprev).show();
                };
            });







But I don´t need the lst-child but the one before last.

Best regards