<html>
<head>
<script type="text/javascript">
function disabl_element()
{
document.getElementById("hid").style.display="none";
}
</script>
</head>

<body>
<form>
<input type="button" value="hide" onclick="disabl_element()" />
<div id="hid">hide me</div>
</form>
</body>
</html>