<html>
<head>
<title></title>
<script src="../Scripts/jquery-1.4.1.min.js" type="text/javascript"></script>
<style type="text/css">
.div1
{
height: 2000px;
}
.div2
{
width: 200px;
height: 200px;
margin-top: 100px;
}
.div2_1
{
position: fixed;
width: 200px;
height: 200px;
z-index: 999;
background-color: #3399FF;
top: 0px;
_position: absolute;
_bottom: auto;
_top: expression(eval(document.documentElement.scrollTop));
}
</style>
<script>
$(function () {
$("#top").click(function () { $('html,body').animate({ scrollTop: '0px' }, 1000); return false; });
})
</script>
<script type="text/javascript">
window.onscroll = function () {
var t = document.documentElement.scrollTop || document.body.scrollTop;
var div2 = document.getElementById("div2");
if (t >= 100) {
div2.className = "div2_1";
} else {
div2.className = "div2";
}
}
</script>
</head>
<body>
<div class="div1">
<div id="div2" class="div2">
<div id="top" style="width: 200px; height: 100px; background-color: Black;">
</div>
</div>
</div>
</body>
</html>
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