Need to show image when validation summary control triggered

I have a Warni开发者_运维百科ng Image(gif). I want to show this image only when Validation Summary control triggered. Any way to display this Image.

Thanks

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Above example from.. below reference link

http://weblogs.asp.net/alnurismail/archive/2008/10/16/asp-net-a-validationsummary-with-some-style.aspx

Please, take a look to below articles.. for more information and examples...

http://sandblogaspnet.blogspot.com/2009/12/showing-image-when-validation-fails.html

http://aspnetresources.com/blog/pimpin_validation_summary_with_css

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You can show an image through CssClass attribute but I'd suggest the jQuery plugin.

.TestClass
{
     background:url(warning.png) no-repeat ;
     padding:3px 10px 3px 10px;
}

Markup

<asp:RequiredFieldValidator 
    ID="RequiredFieldValidator1" 
    runat="server" 
    CssClass="TestClass"
    .....
/>