2_timeout.html

<div style="background:red;position:absolute;top:0px;left:0px;width:100px;height:100px" onclick="run(this)">
</div>

<script type="text/javascript">
  function run(element){
    var direction = 1, i = 0, 
      interval = setInterval(function(){
        i += direction;
        if(i == 1000) direction = -1;
        element.style.left = i + 'px';
        if(i < 0) clearInterval(interval); 
      },10);
  }
</script>