Web page countdown digital clock effect implemented by JS_javascript skills

<script><br> window.onload = function ()<br> {<br> var oCountDown = document.getElementById("countdown");<br> var aInput = oCountDown.getElementsByTagName("input")[0];<br> var timer = null;<br> aInput.onclick = function ()<br> {<br> this.className == "" ? (timer = setInterval(updateTime, 1000), updateTime()) : (clearInterval(timer));<br> this.className = this.className == '' ? "cancel" : '';<br> };<br> function format(a)<br> {<br> return a.toString().replace(/^(d)$/,'0$1')<br> }<br> function updateTime ()<br> {<br> var aSpan = oCountDown.getElementsByTagName("span");<br> var oRemain = aSpan[0].innerHTML.replace(/^0/,'') * 60 parseInt(aSpan[1].innerHTML.replace(/^0/,''));<br> if(oRemain <= 0)<br /> {<br /> clearInterval(timer);<br /> return<br /> }<br /> oRemain--;<br /> aSpan[0].innerHTML = format(parseInt(oRemain / 60));<br /> oRemain %= 60;<br /> aSpan[1].innerHTML = format(parseInt(oRemain));<br /> }<br /> }<br /> </script>


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