Asynchronously load external JavaScript files

loadScriptAsync.js

var loadScriptAsync = function(urls, callback) {
    var loadedList = [];
    for (i=0; i<urls.length; i++) {
        var scriptElem = document.createElement("script");
        scriptElem.src = urls[i];
        scriptElem.onload = function(){
            loadedList.push(true);
            if (loadedList.length == urls.length) {
                callback();
            }
        }
        document.head.appendChild(scriptElem);
    }
})

// urls - string array of script urls
// callback - code to be executed after all scripts are loaded