//------------------
// OK Timer
//------------------
var OKduration = 5 * 1000; // 5 secs

function buttonMessage(buttonId) {
	var button = document.getElementById(buttonId);
	var timer = null;
	var originalText = button.innerText;
	var originalColor = button.style.color;
		
	this.showOK  = function() {
		button.innerText = 'OK';
		startTimer();
	}
	
	this.showErr = function() {
		button.innerText = 'ERR';
		startTimer();
	}

	
	function startTimer() {
		if (timer == null) {
			timer = setTimeout(function() {
				button.innerText = originalText;
				timer = null;
			}, OKduration);
		}
	}

}