$(document).ready(function() {
    function isSelectedPage(href) {
        return (href == window.location.pathname) ? true : false;
    }

    function onRollover(ctrl) {
        ctrl.addClass("navigation-rollover-image");
    }
    function offRollover(ctrl) {
        ctrl.removeClass("navigation-rollover-image");
    }

    $('#navigation > li').each(function() {
        if (isSelectedPage($(this).children('a').attr('href'))) {
            $(this).children('a').addClass('navigation-rollover-image');
        }
    });

    $("#navigation > li > a").mouseover(function() {
        if (!isSelectedPage($(this).attr('href')))
            onRollover($(this));
    });

    $("#navigation > li > a").mouseout(function() {
        if (!isSelectedPage($(this).attr('href')))
            offRollover($(this));
    });
});