You can implement by using this javascript code.
<SCRIPT LANGUAGE="JavaScript">
<!-- This script and many more are available free online at -->
<!-- The JavaScript Source!!
http://javascript.internet.com -->
<!-- Begin
var ms = 0;
var state = 0;
function startstop() {
if (state == 0) {
state = 1;
then = new Date();
then.setTime(then.getTime() - ms);
} else {
state = 0;
now = new Date();
ms = now.getTime() - then.getTime();
document.stpw.time.value = ms;
}
}
function swreset() {
state = 0;
ms = 0;
document.stpw.time.value = ms;
}
function display() {
setTimeout("display();", 50);
if (state == 1) {now = new Date();
ms = now.getTime() - then.getTime();
document.stpw.time.value = ms;
}
}
// End -->
</SCRIPT>
<!-- STEP TWO: Add this onLoad event handler into the BODY tag -->
<BODY onLoad="display()">
<!-- STEP THREE: Put this code into the BODY of your HTML document -->
<CENTER>
<FORM NAME="stpw">
Time:
<INPUT TYPE="text" Name="time">
<INPUT TYPE="BUTTON" Name="ssbutton" VALUE="Start/Stop" onClick="startstop()">
<INPUT TYPE="BUTTON" NAME="reset" VALUE="Reset" onClick="swreset()">
</FORM>
</CENTER>
<p><center>
<font face="arial, helvetica" size="-2">Free JavaScripts provided<br>
by <a href="http://javascriptsource.com">The JavaScript Source</a></font>
</center><p>
<!-- Script Size: 1.42 KB -->
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