<html>
<body>
<script>
window.document.body.onmousemove = aa;
function aa()
{
document.all('up').style.visibility = window.event.y < 10 ? "hidden" : "";
}
</script>
<div id="up" style='visibility:hidden'>hello
</div>
</body>
</html>
<body>
<script>
window.document.body.onmousemove = aa;
function aa()
{
document.all('up').style.visibility = window.event.y < 10 ? "hidden" : "";
}
</script>
<div id="up" style='visibility:hidden'>hello
</div>
</body>
</html>
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