var waiting = null;
var waitingTime = 3000;
function gotoPage(){
  window.location.href = "...";
}
function rewait(){
  if(waiting)
    clearTimeout(waiting);
  waiting = setTimeout("gotoPage()", waitingTime);
}
document.onmousemove = function(){
  rewait();
}
window.onload = function(){
  rewait();
}