Lightweight script loader with callback

loadScript.js

/**
 * Lightwright JS Loader
 *
 * @author Christopher Imrie
 *
 * @param  {String}    name  URL to JS file
 * @param  {Function}  cb    Callback function
 * @return {null}
 */
function loadScript(/** string */ name, /** Function*/ cb) {

    var loaded = false,
        url = String(name),
        eed = document.createElement('script');

    eed.type = 'text/javascript';
    eed.async = true;
    eed.src = url;

    //Listen for script load
    eed.onload = eed.onreadystatechange = function () {
        if ((eed.readyState && eed.readyState !== "complete" && eed.readyState !== "loaded") || loaded) {
            return false;
        }
        eed.onload = eed.onreadystatechange = null;
        loaded = true;

        //Fire callback on script load if supplied
        if (typeof cb === "function") cb();
    };
    document.getElementsByTagName('head')[0].appendChild(eed);
}


/**
 * Usage
 */
loadScript('http://path/to/file.js', function(){
    //Code to run when JS has loaded
});