// JScript 文件

var val1 = document.getElementById("show");
var val3 = document.getElementById("show2");
var val2 = document.getElementById("cover");
val3.innerHTML = val1.innerHTML;
function move()
{
  val1.style.top = (parseInt(val1.style.top) - 1)+"px"; 
  val3.style.top = (parseInt(val3.style.top) - 1)+"px"; 
  if(parseInt(val3.style.top) <= 0)
  {
  	val1.style.top = (parseInt(val3.style.top) + parseInt(val3.offsetHeight))+"px";
  }
  if(parseInt(val1.style.top) <= 0)
  {
  	 val3.style.top = (parseInt(val1.style.top) + parseInt(val1.offsetHeight))+"px";
  }
}
var timeId;
function start()
{  

  if(parseInt(val1.style.top) <= 0)
  {
  	 val3.style.top = (parseInt(val1.style.top) + parseInt(val1.offsetHeight))+"px";
  }else if(parseInt(val3.style.top) <= 0)
  {
  	val1.style.top = (parseInt(val3.style.top) + parseInt(val3.offsetHeight))+"px";
  }

  timeId = window.setInterval("move()",100);
}
function stop()
{
  window.clearInterval(timeId);
}
start();