<asp:TextBox ID="NodeText" runat="server"></asp:TextBox>
<script src="JS/jquery-1.4.2.js" type="text/javascript"></script>
<script type="text/javascript">
$(function() {
$("input#NodeText").bind({ contextmenu: function(e) {
if (e.which == 3)
return false;
},
keyup: function() {
$(this).val("");
}
});
});
</script>