loadCss.js

function loadCss(css) {
    var link;

    if ($.isArray(css)) {
        $.each(css, function (idx, lk) {
            loadCss(lk);
        });
    } else {
        link = document.createElement("link");
        link.type = "text/css";
        link.rel = "stylesheet";
        link.href = css;
        document.getElementsByTagName("head")[0].appendChild(link);
    }
};

loadJs.js

function loadFile(url) {
    var script = document.createElement('script');
    script.src = url;
    document.getElementsByTagName('head')[0].appendChild(script);
}