bookmarklet to load files externally

Bookmarklet to load files

javascript: (function () {
    var addStyleSheet = function (src) {
        var stylesheet = document.createElement('link');
        stylesheet.type = 'text/css';
        stylesheet.rel = 'stylesheet';
        stylesheet.href = src;
        stylesheet.media = 'screen';
        document.getElementsByTagName('head')[0].appendChild(stylesheet);
    };

    var addScript = function (src, callback) {
        c = document.createElement("script");
        c.type = "text/javascript";
        c.src = src;
        c.onload = c.onreadystatechange = callback;
        document.documentElement.childNodes[0].appendChild(c);
    };

    addScript("http://externalsite.com/someRandomJsFile.js", function () {});
})();