code_structure single var

timer.js

$('#timer').focus(function(){
    // turn on timer
	startTimer();
}).blur(function(){
	// turn off timer
	endTimer();
});


var lastValue = "",
	$timer = $('#timer'),
	timerCheckCount = 0,
	checkInputChange = function(){
		timerCheckCount++;
		if(lastValue !== $timer.val()) {
			$timer.next().stop(true, true).fadeIn(0).html('[timer detected changed'+ 
				timerCheckCount + 'times!]' + $timer.val()).fadeOut(2000);
			lastValue = $timer.val();
		}
	},
	timer = null,
	startTimer = function(){
		timer = startTimer(checkInputChange, 200);
	},
	endTimer = function(){
		clearInterval(timer);
		timerCheckCount = 0;
	};