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Instead of <pre><code>StartCountdown.closeInputField; </code></pre> You'll want to call the function with <pre><code>this.closeInputField(); </code></pre> Note: Make sure you use <code>()</code> to call a function. Without them, you're just referencing the function, not calling it. <hr> You also don't have to create the prototype that way. After creating the function, you can simply attach to the existing prototype. <pre><code>var StartCountDown = function() { // ... }; StartCountDown.prototype.closeInputField = function() { // ... }; </code></pre> <hr> After looking taking a look at your fiddle, I see a couple other areas for improvement as well. These are just some ideas for you to use as you'd like. <a href="http://jsfiddle.net/2nXbN/6/" rel="nofollow">Here's a jsfiddle demo</a> Timer <pre><code>var Timer = function(elem) { this.seconds = 0; this.elem = elem; this.initialize(); }; Timer.prototype.initialize = function() { this.timer = document.createElement("span"); this.timer.innerHTML = "0:00"; this.input = document.createElement("input"); this.button = document.createElement("button"); this.button.innerHTML = "Submit"; this.button.addEventListener("click", this.startTimer.bind(this)); this.elem.appendChild(this.timer); this.elem.appendChild(this.input); this.elem.appendChild(this.button); }; Timer.prototype.startTimer = function(event) { this.removeInput(); this.seconds = parseInt(this.input.value) * 60; this.interval = window.setInterval(this.countDown.bind(this), 1000); event.preventDefault(); }; Timer.prototype.stopTimer = function() { this.updateTimer("Done!"); window.clearInterval(this.interval); }; Timer.prototype.updateTimer = function(text) { this.timer.innerHTML = text; }; Timer.prototype.countDown = function() { if (this.seconds === 0) { return this.stopTimer(); } this.updateTimer(this.timeRemaining(this.seconds)); this.seconds--; }; Timer.prototype.timeRemaining = function(seconds) { var minutes = Math.floor(seconds/60), seconds = seconds % 60, separator = seconds % 2 === 0 ? ":" : " "; if (seconds.toString().length < 2) { seconds = [0, 0, seconds].slice(-2).join(""); } return minutes + separator + seconds; }; Timer.prototype.removeInput = function() { this.input.remove(); this.button.remove(); }; </code></pre> Usage Find a DOM element (<code>elem</code>) you want to behave like a timer and call <code>new Timer(elem)</code> <pre><code>var timer = document.getElementsByTagName("div")[0]; new Timer(timer); </code></pre> Multiple timers <pre><code>var timers = document.getElementsByTagName("div"); for (var i=0, len=timers.length; i<len; i++) { new Timer(timers[i]); } </code></pre>
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