<SCRIPT LANGUAGE="JavaScript">
<!--// Copyright (c) 1996 Tomer Shiran. All rights reserved.
// Permission given to use this script provided that the copyright
// notice remains as is. Additional scripts and information are 
// available at http://geocities.datacellar.net/SiliconValley/9000/
// set initial values
var timerRunning = false
var timerID = null
// create instance of Date object representing current time
var initial = new Date()
// start timer

function start() { 
 // set the button's label to "stop" 
  document.forms[0].general.value = "stop" 
 // assign the stop function reference to the button's onClick event handler 
  document.forms[0].general.onclick = stop 
 // ask the user if to reset the timer 
  if (confirm("Would you like to reset the timer?"))  
 // set global variable to new time  
  initial = new Date()   
 // assign milliseconds since 1970 to global variable 
  startTime = initial.getTime() 
 // make sure the timer is stopped 
  stopTimer() 
 // run and display timer 
  showTimer()
}

// set button to initial settings

function stop() { 
 // set the button's label to "start" 
  document.forms[0].general.value = "start" 
 // assign the start function reference to the button's onClick event handler 
  document.forms[0].general.onclick = start 
 // stop timer 
  stopTimer()
}
 // stop timer

function stopTimer() { 
 // if the timer is currently running 
  if (timerRunning)  
 // clear the current timeout (stop the timer)  
  clearTimeout(timerID) 
 // assign false to global variable because timer is not running 
  timerRunning = false
}

function showTimer() { 
 // create instance of Date representing current timer 
  var current = new Date() 
 // assign milliseconds since 1970 to local variable 
  var curTime = current.getTime() 
 // assign difference in milliseconds since timer was cleared 
  var dif = curTime - startTime  
 // assign difference in seconds to local variable 
  var result = dif / 1000 
 // is result is not positive 
  if (result < 1)  
 // attach an initial "0" to beginning  
  result = "0" + result  
 // convert result to string 
  result = result.toString() 
 // if result is integer 
  if (result.indexOf(".") == -1)  
 // attach ".00" to end  
  result += ".00" 
 // is result contains only one digit after decimal point 
  if (result.length - result.indexOf(".") <= 2)  
 // add a second digit after point  
  result += "0" 
 // place result in text field 
  document.forms[0].display.value = result 
 // call function recursively immediately (must use setTimeout to avoid overflow) 
  timerID = setTimeout("showTimer()", 0) 
 // timer is currently running 
  timerRunning = true
}
// -->
</SCRIPT>
<FORM><INPUT TYPE="text" NAME="display" VALUE="" onFocus="this.blur()"><INPUT TYPE="button" NAME="general" VALUE="start" onClick="start()"></FORM>