$('document').ready(function () {
    $('.historyAPI').on('click', function (e) {
        e.preventDefault();
        var href = $(this).attr('href');
        getContent(href, true);
    });
});

window.addEventListener("popstate", function (e) {
    getContent(location.pathname, false);
});

function getContent(url, addEntry) {
    $.get(url, onAjaxSuccess);
    function onAjaxSuccess(data)
    {
        contentHolder.innerHTML = '';
        contentHolder.innerHTML = data;
    }
    if (addEntry == true) {
        history.pushState(null, null, url);
    }

}