Jason,
Demo is here:
http://cutesoft.net/example/RequiredFieldValidator.aspxIn the above example, the client script is enabled.
<asp:RequiredFieldValidator
EnableClientScript="true" id="RequiredFieldValidator1" runat="server" ErrorMessage="RequiredFieldValidator" ControlToValidate="Editor1" Text="<h3>The body field is required!</h3>"></asp:RequiredFieldValidator>
keep me posted
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