<script>
var tid=null;
var secTime=20;  //20秒
var i=1;
function startClose(){
   tid=setTimeout("window.close()",secTime*1000)   
}function stopClose(){
  i=1;
  if (tid) clearTimeout(tid)
  startClose()
}
setInterval("window.status=i++",1000)window.onload=startClose
document.onkeypress=stopClose
document.onmousedown=stopClose
document.onmousemove=stopClose
</script>