[Jolt]

This is sort of the reverse of what you asked but will function the same basically. Rather than counting how long a window is open it counts down from a specific time interval.

Copy and paste this into the body of your page.

<script language="JavaScript" type="text/javascript">

   //Set the time to wait in seconds
   var countDownInterval=5;
			
			
   var countDownTime=countDownInterval+1;
   function countDown(){
      countDownTime--;
      if (countDownTime <=0){
      countDownTime=countDownInterval;
      clearTimeout(counter)
				
      //Set the page to go to
      window.location = 'page2.htm'
      return
   }

   if (document.all) //if IE 4+
   document.all.countDownText.innerText = countDownTime+" ";
   else if (document.getElementById) //else if NS6+
   document.getElementById("countDownText").innerHTML=countDownTime+" "
   else if (document.layers){ 
			
      //CHANGE TEXT BELOW TO YOUR OWN
      document.c_reload.document.c_reload2.document.write('Redirect in <strong id="countDownText">'+countDownTime+' </strong> seconds')
      document.c_reload.document.c_reload2.document.close()
   }
   counter=setTimeout("countDown()", 1000);
   }
   function startit(){
      if (document.all||document.getElementById) 
			
      //CHANGE TEXT BELOW TO YOUR OWN
      document.write('Redirect in <strong id="countDownText">'+countDownTime+' </strong> seconds')
      countDown()
   }
   if (document.all||document.getElementById)
   startit()
   else
   window.onload=startit
</script>