var MultiLang = function(url, lang, onload) {
	
	this.phrases = {};
	this.selectedLanguage = (lang || navigator.language || navigator.userLanguage).substring(0, 2);;
	
	this.onLoad = onload;
	
	if (typeof url !== 'undefined') {
		var obj = this;
		var req = new XMLHttpRequest();
		
		req.open("GET", url, true);
		
		req.onreadystatechange = function (evt) {
			if (evt.target.readyState == 4 && evt.target.status == 200) {
				this.phrases = JSON.parse( evt.target.responseText );
				this.setLanguage(this.selectedLanguage);
				
				if (this.onLoad) {
					this.onLoad();
				}
			};
		}.bind(obj);
		
		req.addEventListener("error", function(e) {
			console.log('MultiLang.js: Error reading json file.');
		}, false);
		
		req.send(null);
	};

	this.setLanguage = function(langcode) {
		
		if (!this.phrases.hasOwnProperty(langcode)) {
			for (var key in this.phrases) {
				if (this.phrases.hasOwnProperty(key)) {
					langcode = key;
					break;
				};
			};
		};
		
		this.selectedLanguage = langcode;
	};

	this.get = function(key) {
		var str;
		
		if (this.phrases[this.selectedLanguage])
			str = this.phrases[this.selectedLanguage][key];
		
		str = (str || key);
		
		return str;
	};
}