Strophe.addConnectionPlugin('muc', {
	init: function(conn) {
		this._connection = conn;
	},
	join: function(room, nickname, password, callback) {
		var msg = Strophe.xmlElement("presence", [
							     ["from", this._connection.jid],
							     ["to", room + "/" + nickname]
						]);
		var x = Strophe.xmlElement("x", [["xmlns", Strophe.NS.MUC]]);
		if(password) {
		    var password_elem = Strophe.xmlElement("password", [],password);
		    x.appendChild(password_elem);
		}
		msg.appendChild(x);
		if(typeof(callback) == 'function') {
			this._connection.addHandler(callback,
						    null,
						    "presence",
						    null,
						    null,
						    room+'/'+nickname);
		
		}
		this._connection.send(msg);
	},
	leave: function(room, nickname, callback) {
		var presenceid = this._connection.getUniqueId();
		var presence = Strophe.xmlElement("presence", [
							   ["type",
							    "unavailable"],
							   ["id",
							    presenceid],
							   ["from",
							    this._connection.jid],
							   ["to",
							    room + "/" + nickname]
					      ]);
		var x = Strophe.xmlElement("x", [
					     ["xmlns", Strophe.NS.MUC]
				       ]);
		presence.appendChild(x);
		if(typeof(callback) == 'function') {
			this._connection.addHandler(callback,
						    null,
						    "presence",
						    null,
						    presenceid,
						    null);
		}
		this._connection.send(presence);
	},
	nick: function(room, nickname, newNickname) {
		var msg = Strophe.xmlElement("presence", [
			      ["from", this._connection.jid],
			      ["to", room + "/" + newNickname]
		 ]);
		var x = Strophe.xmlElement("x", [["xmlns", Strophe.NS.MUC]]);
		msg.appendChild(x);
		this._connection.send(msg);
    },
	_htmlentities: function(text) {
	    text = text.replace(/\&/g, "&");
	    text = text.replace(/</g,  "&lt;");
	    text = text.replace(/>/g,  "&gt;");
	    text = text.replace(/'/g,  "&#39;");
    
	    return text;
	},
	_buildAndSendMessage: function(to, message, type) {
		var text = this._htmlentities(message);
		var msgid = this._connection.getUniqueId();
		var msg = Strophe.xmlElement("message", 
						[
						 ["to", to],
						 ["from", this._connection.jid],
						 ["type", type],
						 ["id", msgid]
						 ]);
		msg.appendChild(Strophe.xmlElement("body", 
						      [["xmlns", 
							"jabber:client"]], 
						      text));
	
		var x = Strophe.xmlElement("x", 
					  [["xmlns", "jabber:x:event"]]);
		x.appendChild(Strophe.xmlElement("composing"));
		msg.appendChild(x);
		this._connection.send(msg);
    },
	sendMessage: function(room, message){
		this._buildAndSendMessage(room, message, 'groupchat')
	}
});