A custom timer that can be paused and restarted

timer.js

function timer(callback, timeOut) {
  var store, timeStarted; // Use store for holding data to allow clearTimeout
  var remaining = timeOut;

	this.start = function() {
		timeStarted = new Date();
		store = setTimeout(callback, remaining);
	}

	this.pause = function() {
		clearTimeout(store);
		remaining -= new Date() - timeStarted;
	}

	this.updateTimeOut = function(newTimeOut){
		clearTimeout(store);
		store = setTimeout(callback, newTimeOut);
	}
	
	this.start()
}

timer = new timer(function() {
	/* Do Something */
}, timeOut);