function selectNav() {
    if (document.getElementById) {
        var nav = document.getElementById('nav');
        if (nav) {
            var anchors = nav.getElementsByTagName('a');
            for (var i=0; i < anchors.length; i++) {
                var a = anchors[i];
                if (location.href.indexOf(a.id) != -1) {
                    a.className = 'selected';
                }
                else {
                    a.className = 'notselected';
                }
            }
        }
    }
}

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