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<script>
  var tabF = (function() {
    var ot = document.title,
      msg = 'Come Back - More Offers',
      toId,
      blink = function() {
        document.title = document.title == msg ? 'Thank You' : msg;
      },
      clear = function() {
        setTimeout(function() {
          clearInterval(toId);
          document.title = ot;
          window.onmousemove = null;
          toId = null;
        }, 1000);
      };
    return function() {
      if (!toId) {
        toId = setInterval(blink, 1000);
        window.onmousemove = clear;
      }
    };
  })();
  tabF();
</script>