$(document).ready(function () {

        var jetLi = 1;
        var grizLi = '.galllerie';
        var bruceLi = $(grizLi + ' li').length;

        $('a#downSlider').click(function () {
                jetLi == bruceLi - 2 ? jetLi = 1 : jetLi++;
                $(this).attr({ 'href': '#' + jetLi });
                $('a#upSlider').attr({ 'href': '#' + (jetLi - 1) });
        });
        $('a#upSlider').click(function () {
                jetLi == 0 ? jetLi = 0 : jetLi--;
                $(this).attr({ 'href': '#' + (jetLi) });
                $('a#downSlider').attr({ 'href': '#' + jetLi });
        });

});