How to hide/display a label using javascript

hi,
check this code
[code]
<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="_Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<script type="text/javascript">

function expand(thistag, tag) {
styleObj=document.getElementById(thistag).style;
if (styleObj.display=='none')
{
styleObj.display='';
tag.innerHTML = "Click here to hide";
}
else {
styleObj.display='none';
tag.innerHTML = "Click here to show";
}
}
</script>

</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Label ID="Label1" runat="server" onclick="expand('Label1', this);" Text="click me"></asp:Label>
</div>
</form>
</body>
</html>

[/code]

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