<!-- http://bbs.knowsky.com/ -->
<!--要完成此效果把如下代码加入到<body>区域中-->
<SCRIPT LANGUAGE="JavaScript">
<!-- Begin
function hidden()
{document.body.style.overflow='hidden';}
function unhidden()
{document.body.style.overflow='';}
// End -->
</script>
<div align="center">
<form>
<input type="button" value="隐藏滚动条" onclick="hidden()"><br>
<input type="button" value="显示滚动条" onclick="unhidden()">
</form>
</div>