title: Show "passed" image or text after validating an asp.net (req. field)validator
body: <p>I have the following asp.net code:</p>
  
  <pre><code>&lt;asp:TextBox CssClass="mf" runat="server" ID="mail1" Width="270" /&gt;
  &lt;asp:RequiredFieldValidator ID="rfv1" 
                              runat="server" 
                              ControlToValidate="mail1" 
                              Display="Dynamic" /&gt;
  </code></pre>
  
  <p>Now I want to show an image (or text) if the validation passes on the fly (no postback)</p>
  
  <p>A jQuery solution is also fine by me, but that wouldn't be so safe if javascript is disabled.</p>