<html>
<head>
<style>
DIV{width:200;height:150;border:solid 1px;overflow-x:hidden;overflow-y:scroll;}
body {margin:0;background-color : transparent;}
</style>
</head>
<body>
<DIV style="left:440px;position:absolute;top:20px;" onscroll="document.getElementById('ToScroll').scrollTop = this.scrollTop;">
http://www.baidu.com
http://www.baidu.com
http://www.baidu.com
http://www.baidu.com
http://www.baidu.com
http://www.baidu.com
http://www.baidu.com
http://www.baidu.com
http://www.baidu.com
http://www.baidu.com
http://www.baidu.com
http://www.baidu.com
</DIV>
<DIV id="ToScroll" style="left:220px;position:absolute;top:20px;overflow:hidden;">
http://www.163.com
http://www.163.com
http://www.163.com
http://www.163.com
http://www.163.com
http://www.163.com
http://www.163.com
http://www.163.com
http://www.163.com
</DIV >
<head>
<style>
DIV{width:200;height:150;border:solid 1px;overflow-x:hidden;overflow-y:scroll;}
body {margin:0;background-color : transparent;}
</style>
</head>
<body>
<DIV style="left:440px;position:absolute;top:20px;" onscroll="document.getElementById('ToScroll').scrollTop = this.scrollTop;">
http://www.baidu.com
http://www.baidu.com
http://www.baidu.com
http://www.baidu.com
http://www.baidu.com
http://www.baidu.com
http://www.baidu.com
http://www.baidu.com
http://www.baidu.com
http://www.baidu.com
http://www.baidu.com
http://www.baidu.com
</DIV>
<DIV id="ToScroll" style="left:220px;position:absolute;top:20px;overflow:hidden;">
http://www.163.com
http://www.163.com
http://www.163.com
http://www.163.com
http://www.163.com
http://www.163.com
http://www.163.com
http://www.163.com
http://www.163.com
</DIV >
function fnHandlescroll()
{
var scrollLeft = document.body.scrollLeft;
var window1 = window.parent.frames[0].window;
window1.scrollTo(scrollLeft, 0);
}<body onscroll="fnHandlescroll();" >第一个页面中.
function fnHandlescroll()
{//javastricpt脚本放在HEAD中
var scrollLeft = document.body.scrollLeft;
var window1 = window.parent.frames[1].window;
window1.scrollTo(scrollLeft, 0);
}<body onscroll="fnHandlescroll();" >
a.scrollTop=b.scrollTop滚动a
b.scrollTop=a.scrollTop