Хотя это работает для div, оно не работает для iframes.
Вот что вы можете сделать,
$($('#iframe1').contents()).scroll(function(){
$($('#iframe2').contents()).scrollTop($(this).scrollTop());
});
С помощью события прокрутки jQuery вы сможете синхронизировать их.
Редактировать : Плагины не требуются. Вот код, который работал для меня:
<html>
<head>
<SCRIPT language="javascript" type="text/javascript" src="jquery-1.3.2.js"></SCRIPT>
<SCRIPT>
$(document).ready(function()
{
$("#div1").scroll(function () {
$("#div2").scrollTop($("#div1").scrollTop());
$("#div2").scrollLeft($("#div1").scrollLeft());
});
$("#div2").scroll(function () {
$("#div1").scrollTop($("#div2").scrollTop());
$("#div1").scrollLeft($("#div2").scrollLeft());
});
});
</SCRIPT>
</head>
<body>
<div id="div1" style="overflow:auto;height:100px;width:200px;border:1px solid black;">
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</div>
<div id="div2" style="overflow:auto;height:100px;width:200px;border:1px solid black;">
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</div>
</body>
</html>