U.Helper

tm = setInterval('timeout(40)',1000);
function timeout(time){
  time--;
  document.title = time;
  if(time < 0){
   document.title = 'Timeout';
   clearInterval(tm);
  }
}

setTimeout('document.title = "Timeout";', 40000);

<script type="text/javascript">
tm = setInterval('timeout(40)',1000);  
  function timeout(time){  
   time--;  
   document.title = time;  
   if(time < 0){  
    document.title = 'Timeout';  
    clearInterval(tm);  
   }  
  }
</script>