<html>
<head>
<style type="text/css">
#b1
{
position:absolute;
}
</style>
<script>
function displayResult()
{
document.getElementById("b1").style.top="100px";
}
</script>
</head>
<body>
<input type="button" id="b1" onclick="displayResult()" value="Set top position to 100 px">
</body>
</html>