Simple 'setTimeout' wrapper which acts as player

timer.js

function Timer(callback, delay) {
	var timerId, start, remaining = delay, going = false;

	var _callback = function() {
		callback();
		remaining = delay;
		going = false;
	};

	this.wait = function() {
		if (!going) return;
		clearTimeout(timerId);
		remaining -= new Date() - start;
		going = false;
	};


	this.go = function() {
		start = new Date();
		timerId = setTimeout(_callback, remaining);
		going = true;
	};
}

// for node.js users:
module.exports = Timer;

// Usage:
var playingEnd = function(){ console.log('ended!') };
var player = new Timer(playingEnd, 5000);
player.go(); 		// starts counting off
player.pause(); 	// pauses counting off
player.go();		// resumes counting off

player.go();		// can be called after timeout to restart counting for time given while initialization