function select_nav() {
    var nav_links = document.getElementById('topnav')
     .getElementsByTagName('a');
    var selected = location.pathname;


    if (selected != "/") {

    for (var i = 0; i < nav_links.length; i++) {
        var link = nav_links[i].pathname;
       
        // fiddle IE's view of the link
        if (link.substring(0, 1) != '/')
            link = '/' + link;

       
            if (link == selected ) {
                nav_links[i].setAttribute('className', 'active');
                nav_links[i].setAttribute('class', 'active');
                $('ul#topnav li a[href$="' + link + '"]').parent().find('img').css("visibility", "visible");
            }
            else {
                nav_links[i].setAttribute('className', '');
                nav_links[i].setAttribute('class', '');
                $('ul#topnav li a[href$="' + link + '"]').parent().find('img').css("visibility", "hidden");
            }
         }
    }
    else {
        $('ul#topnav li a[href$="/"]').attr('class', 'active');
        $('ul#topnav li a[href$="/"]').parent().find('img').css("visibility", "visible");
    } 
}

window.onload = function () {
    select_nav();
};