会动的表格

  <script type="text/javascript">
var intervalId = null;
function move(id,state){
  var obj = document.getElementById(id);
  if(intervalId != null) 
window.clearInterval(intervalId);
  function change(){
   var h = parseInt(obj.offsetHeight);
   obj.style.height = (state == "down") ? (h + 2) : (h - 2);
  }
  intervalId = window.setInterval(change,10);
}
</script>
<table border="1" cellpadding="0" cellspacing="0" id="mytd" onmouseover="move('mytd','down');" onmouseout="move('mytd','out');">
<tr><td>会动的表格</td></tr></table>