Exam Countdown timer

Hi Experts!
i just want to ask for your help regarding my timer. I've been working for an exam timer wherein the value of the time will come from a database. in my jsp, I've used hidden fields to retrive the data from the database but when i get the value of the hidden field using javascript, the value return NaN. But the timer is running. Its just that the display time is NaN. Im sure that the hidden fields contains the right value because when i try to make it a textbox, it shows the value. With this scenario, can someone please tell me the possible solution for this code?How can I display the right value in my timer?
here's the code:
var gethr = "<%=request.getAttribute(txt_hr)%>";
var getmin ="<%=request.getAttribute(txt_min)%>";
var sec = "<%=request.getAttribute(txt_se")%>";
var hr= parseInt(gethr);
var min= parseInt(getmin);
var sec= parseInt(getsec);
var lab="timer";
function start() {
displayCountdown(lab);
loaded(lab,start);
var pageLoaded = 0;
function loaded(i,f) {
if (document.getElementById && document.getElementById(i) != null) f();
else if (!pageLoaded) setTimeout('loaded(\''+i+'\','+f+')',100);
function calculate(){
sec--;
if (sec == -01)
sec = 59;
min = min - 1;
else { min = min; }
if (sec<=9)
sec = "0" + sec;
if(min==-01)
min=59;
hr= hr-1;
function displayCountdown(timer) {
calculate();
var time = (hr<=9 ? "0" + hr : hr)+" : " + (min<=9 ? "0" + min : min)+" : " + sec ;
document.getElementById(timer).innerHTML =time;
// To check time is over or not
if (hr=='00' && min == '00' && sec == '00')
sec = "00";
alert("stop");
}else{
SD=setTimeout('displayCountdown(\''+timer+'\');',1000);
Any respond will be very much appreciated. Many thanks!! =)
Best Regards,
-- chjylene --

The problem lies at the client side. Make use of client side languages such as Javascript. If you really insist in using Java, rather consider an Applet or [Web Start Application|http://google.com/search?q=jnlp+tutorial+site:sun.com] which you on its turn can embed in your JSP.

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