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<html>
<head>
<script type="text/javascript">
function OnScrollDiv() {
    var div1 = document.getElementById("div1");
    var div2 = document.getElementById("div2");
    div2.scrollTop = div1.scrollTop * 2;
    alert(div1.scrollTop);
    alert(div2.scrollTop);
}
</script>
</head>
<body>
    <div style="width: 250px; height: 250px; overflow: scroll; float: left;" id="div1" onscroll="OnScrollDiv();">1 i dont know whhy i am typing this<br>2 i dont know whhy i am typing this<br>3 i dont know whhy i am typing this<br>4 i dont know whhy i am typing this<br>i dont know whhy i am typing this<br>i dont know whhy i am typing this<br>i dont know whhy i am typing this<br>i dont know whhy i am typing this<br>i dont know whhy i am typing this<br>i dont know whhy i am typing this<br>i dont know whhy i am typing this<br>i dont know whhy i am typing this<br>i dont know whhy i am typing this<br>
    </div>
    <div style="width: 150px; height: 250px; overflow: scroll; float: left;" id="div2">1 Start of div2<br>2 Start of div2<br>3 Start of div2<br>4 Start of div2<br>Start of div2<br>Start of div2<br>Start of div2<br>Start of div2<br>Start of div2<br>Start of div2<br>Start of div2<br>Start of div2<br>Start of div2<br>Start of div2<br>Start of div2<br>Start of div2<br>Start of div2<br>Start of div2<br>Start of div2<br>Start of div2<br>Start of div2<br>Start of div2<br>Start of div2<br>Start of div2<br>Start of div2<br>Start of div2<br>Start of div2<br>Start of div2<br>Start of div2<br>Start of div2<br>Start of div2<br>Start of div2<br>Start of div2<br>Start of div2<br>Start of div2<br>Start of div2<br>Start of div2<br>Start of div2<br>Start of div2<br>Start of div2<br>Start of div2<br>Start of div2<br>Start of div2<br>Start of div2<br>Start of div2<br>Start of div2<br>Start of div2<br>Start of div2<br>Start of div2<br>Start of div2<br>Start of div2<br>Start of div2<br>Start of div2<br>Start of div2<br>Start of div2<br>Start of div2<br>Start of div2<br>Start of div2<br>Start of div2<br>Start of div2<br>Start of div2<br>Start of div2<br>Start of div2<br>Start of div2<br>Start of div2<br>Start of div2<br>Start of div2<br>Start of div2<br>Start of div2<br>Start of div2<br>
    </div>
</body>