[qwerty-клавиатура]

function loadScript(url, cb) {
    var d = document, 
        s = d.createElement('script');
    s.src = url;
    s.onload = cb;
    d.head.appendChild(s);
}

function loadScripts(urls, cb) {
    loadScript( urls.shift(), function() {
        if (urls.length) {
            return loadScripts(urls, cb);
        }
        
        cb && cb();
    } );
}