Asp.net MVC 3 custom error message

I like to customize the error information, such as adding an incorrect small icon and creating an incorrect style. I found that the default @ Html. ValidationMessage cannot reach my goal.

Create Model:

    Public ClassLogin_Index
{
[DisplayName ("Logon account")]
[Required (ErrorMessage= "Logon account cannot be blank")]
        Public StringUser_name {Set;Get;}

[DisplayName ("Logon Password")]
[Required (ErrorMessage= "The logon password cannot be blank.")]
        Public StringUser_password {Set;Get;}
}

Create HTML:

@ Using (Html. BeginForm ())
{
                <FieldsetClass= "Form">
@ Html. ValidationImage ()
                    <P>
@ Html. LabelFor (m => m. user_name)
@ Html. TextBoxFor (m => m. user_name)
                    </P>
                    <P>
@ Html. LabelFor (m => m. user_password)
@ Html. TextBoxFor (m => m. user_password)
                    </P>
                    <ButtonType= "Submit"Class= "Positive"Name= "Submit">
<ImgSrc= "/Content/images/key.png"Alt= "Announcement" />Login</Button>
                    <UlId= "Forgottenpassword">
                        <LiClass= "Boldtext">|</Li>
                        <Li> <AHref= "/Login/forgot">What should I do if I forget my password?</A> </Li>
                    </Ul>
                </Fieldset>
}

Action operation:

        /// <Summary>
        ///User Logon Process
        /// </Summary>
        /// <Returns> </returns>
[HttpPost]
        PublicActionResult Index (Login_Index model)
{
            If(ModelState. IsValid)
                ReturnRedirectToAction ("Index","Home");
            Else
{
                ReturnView ();
}
}

Extended HtmlHelper: