Hi Parth Akhbari,
Here is your working solution:
<head runat="server">
<title></title>
<script src="js/jquery-1.8.2.js" type="text/javascript"></script>
<script type="text/javascript">
$(document).ready(function () {
$('#prvnote').hide();
$('#regclass').click(ShowHideDivs);
});
function ShowHideDivs() {
if ($('#prvnote').css('display') == 'block') {
$('#prvnote').hide();
$('#newdiv').show();
$('#regclass span').text('Post Note');
}
else {
$('#prvnote').show();
$('#newdiv').hide();
$('#regclass span').text('View Previous Note');
}
}
</script>
</head>
<body>
<div id="regclass"><span>Post Note</span></div>
<div id="newdiv"><form>NEW DIV SHOWN</form></div>
<div id="prvnote"><form>PREV NOTE DIV SHOWN</form></div>
</body>
</html>