如何在网页上自动滚屏完成后进行网页的自动刷新，或者也可以问如何判断自动滚屏的是否结束？

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<title>系统一览图</title>
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<html>
<head>
<script language="javascript">
var currentpos,timer;
function initialize()
{
timer=setInterval("scrollwindow()",10);
}
function sc()
{
clearInterval(timer);
}
function scrollwindow()
{
currentpos=document.body.scrollTop;
window.scroll(0,++currentpos);
if (currentpos != document.body.scrollTop)
window.location.reload();
return ;}
document.ondblclick=initialize
</script></head>
<body>
<form name="x" >
  <table width="100%"  border="0" cellspacing="0" cellpadding="0">
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td>1</td>
    </tr>
    <tr>
      <td>1</td>
    </tr>
    <tr>
      <td>3</td>
    </tr>
    <tr>
      <td>2</td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td>23</td>
    </tr>
    <tr>
      <td>42</td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td>34</td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td>4234</td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td>234</td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td>2342</td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td>23423</td>
    </tr>
  </table>
</form></body>
</html>
if (currentpos != document.body.scrollTop)
window.location.reload();
是不行的，页一直在刷新
if(bdy.clientHeight+bdy.scrollTop>=bdy.scrollHeight){
alert("already bottom! refresh now!");
window.location.reload();
不行
我这可以没有一直刷新<html>
<head>
<script language="javascript">
var currentpos,timer;
function initialize()
{
timer=setInterval("scrollwindow()",10);
}
function sc()
{
clearInterval(timer);
}
function scrollwindow()
{
currentpos=document.body.scrollTop;
window.scroll(0,++currentpos);
if (currentpos != document.body.scrollTop)
window.location.reload();
return ;}
document.ondblclick=initialize
</script></head>
<body onLoad="alert('111')">
<form name="x" >
  <table width="100%"  border="0" cellspacing="0" cellpadding="0">
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td>1</td>
    </tr>
    <tr>
      <td>1</td>
    </tr>
    <tr>
      <td>3</td>
    </tr>
    <tr>
      <td>2</td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td>23</td>
    </tr>
    <tr>
      <td>42</td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td>34</td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td>4234</td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td>234</td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td>2342</td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td>23423</td>
    </tr>
  </table>
  <table width="100%"  border="0" cellspacing="0" cellpadding="0">
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td>1</td>
    </tr>
    <tr>
      <td>1</td>
    </tr>
    <tr>
      <td>3</td>
    </tr>
    <tr>
      <td>2</td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td>23</td>
    </tr>
    <tr>
      <td>42</td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td>34</td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td>4234</td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td>234</td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td>2342</td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td>23423</td>
    </tr>
  </table><table width="100%"  border="0" cellspacing="0" cellpadding="0">
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td>1</td>
    </tr>
    <tr>
      <td>1</td>
    </tr>
    <tr>
      <td>3</td>
    </tr>
    <tr>
      <td>2</td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td>23</td>
    </tr>
    <tr>
      <td>42</td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td>34</td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td>4234</td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td>234</td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td>2342</td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td> </td>
    </tr>
    <tr>
      <td>23423</td>
    </tr>
  </table>
</form></body>
</html>