adam.js

// ...

load: function(url, callback) {
            var newScript = document.createElement("script");
            newScript.type = "text/javascript";
            newScript.src = url;

            if(newScript.readyState) {
                newScript.onreadystatechange = function() {
                    if(newScript.readyState == "loaded" || newScript.readyState == "complete") {
                        newScript.onreadystatechange = null;
                        callback();
                    }
                };
            } else {
                newScript.onload = function() { callback(); }
            }

            document.documentElement.firstChild.appendChild(newScript);
}

// ...