(function() {

var nav  = $('ul.nav');
var path = window.location.pathname.split('/').slice(1,-1);
var search = window.location.search;
function activate(p) {
    nav.find('li>a[href="/' + p + search + '"]').parent().addClass('active');
}
if (path.length)
    for(; path.length; path.pop())
        activate(path.join('/') + '/');
else
    activate('');

})()