load a script, like a jsonp file, with callback and scope support
/**
* Carrega um script e executa callback
*/
(function(window, document, head) {
if(!window.loadScript) {
window.loadScript = function(url, callback, scope, charset) {
var sc = document.createElement('script');
sc.type = 'text/javascript';
sc.async = true;
sc.charset = charset || "utf-8";
sc.src = url;
sc.onload = sc.onreadystatechange = (function(url, callback, scope, sc){
return function(){
if (!sc.readyState || sc.readyState == "loaded" || sc.readyState == "complete") {
head.removeChild(sc);
sc.onload = sc.onreadystatechange = null;
if(typeof callback == "function") {
callback.call(scope || null);
}
}
}
})(url, callback, scope, sc);
head.insertBefore(sc, head.firstChild);
return {"o":sc};
}
}
}(window, document, document.getElementsByTagName("head")[0]));