gistfile1.js

(function (jsonp, d) {
    console.log('json-p request');
	var request = 0,
            callbacks = {};
	
	// takes callback object of the form:
	// { 
	//		name : 'customCallback',
	//		fun : myCallbackFunction
	// }
	// this allows for callbacks with names other than the generic 'callback' or 'jsonp'
	jsonp.get = function(url, data, callback) {
		var head = Alt.getTag('head')[0],
			script = d.createElement('script');

		data[callback.name] = 'Alt.jsonp.callbacks.request_' + request;
		
		callbacks['request_' + request] = function(data) {
			head.removeChild(script);
			delete callbacks['request_' + request];
			callback.fun(data);
		};

		request++;
		
		if (!Alt.util.isEmpty(data)) url += Alt.util.encodeParams(data);

		script.type = 'text/javascript';
		script.async = true;
		script.src = url;
		
		head.appendChild(script);
	};
	
	jsonp.callbacks = callbacks;

}(Alt.jsonp = Alt.jsonp || {}, document));