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Cannot get ASP.NET MVC client side validation working

I have in the fact copied the code of Login page in the ASP.NET MVC application template (provided with VS). In the original template, client side validation is working but when I copy all the connected code I get only server side validation (no red fields, post back even if data are incorrect).

Here is my model code:

public class LogOnModel {
    [Required]
    [Display(Name = "User name")]
    public string UserName { get; set; }

    [Required]
    [DataType(DataType.Password)]
    [Display(Name = "Password")]
    public string Password { get; set; }

    [Display(Name = "Remember me?")]
    public bool RememberMe { get; set; }
}

Here is the controller:

public class LogOnController : Controller
{
    public ActionResult Index() {
        return View();
    }

    [HttpPost]
    public ActionResult Index(LogOnModel model)
    {
        if (ModelState.IsValid) {
            return RedirectToAction("Index", "Games");
        }

        return View(model);
    }
}

And this is the View:

<%@ Page Title="" Language="C#" Inherits="System.Web.Mvc.ViewPage<PuzzleHunter.Web.Models.LogOnModel>" MasterPageFile="~/Views/Shared/SiteMasterPage.master" %>
<asp:Content runat="server" ID="Content" ContentPlaceHolderID="MainContent">

<script src="<%: Url.Content("~/Scripts/jquery.validate.min.js") %>" type="text/javascript"></script>
<script src="<%: Url.Content("~/Scripts/jquery.validate.unobtrusive.min.js") %>" type="text/javascript"></script>

<% using (Html.BeginForm()) { %>
    <%: Html.ValidationSummary(true, "Login was unsuccessful. Please correct the errors and try again.") %>
    <div>
        <fieldset>
            <legend>Account Information</legend>
            <div class="editor-label">
                <%: Html.LabelFor(m => m.UserName) %>
            </div>
            <div class="editor-field">
                <%: Html.TextBoxFor(m => m.UserName) %>
                <%: Html.ValidationMessageFor(m => m.UserName) %>
            </div>

            <div class="editor-label">
                <%: Html.LabelFor(m => m.Password) %>
            </div>
            <div class="editor-field">
                <%: Html.PasswordFor(m => m.Password) %>
                <%: Html.ValidationMessageFor(m => m.Password) %>
            </div>

            <div class="editor-label">
                <%: Html.CheckBoxFor(m => m.RememberMe) %>
                <%: Html.LabelFor(m => m.RememberMe) %>
            </div>
            <p>
                <input type="submit" value="Log On" />
            </p>
        </fieldset>
    </div>
<% } %>

I also have following lines in my Web.config file:

<appSettings>
    <add key="ClientValidationEnabled" value="true"/>
    <add key="UnobtrusiveJavaScriptEnabled" value="true"/>
</appSettings>

Edit

I include here the output html code:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">


<head id="Head1"><title>
    Šifrovačky  

    </title><link href="Content/Site.css" rel="stylesheet" type="text/css" />
    <script src="/Scripts/jquery-1.4.4.min.js" type="text/javascript"></script>
</head>
<body>
    <div class="content">


    <script src="/Scripts/jquery.validate.min.js" type="text/javascript"></script>
    <script src="/Scripts/jquery.validate.unobtrusive.min.js" type="text/javascript"></script>

    <form action="/Logon" method="post">
        <div>
            <fieldset>
                <legend>Account Information</legend>

                <div class="editor-label">
                    <label for="UserName">User name</label>
                </div>
                <div class="editor-field">
                    <input data-val="true" data-val-required="The User name field is required." id="UserName" name="UserName" type="text" value="" />
                    <span class="field-validation-valid" data-valmsg-for="UserName" data-valmsg-replace="true"></span>
                </div>

                <div class="editor-label">
                    <label for="Password">Password</label>
                </div>
                <div class="editor-field">
                    <input data-val="true" data-val-required="The Password field is required." id="Password" name="Password" type="password" />
                    <span class="field-validation-valid" data-valmsg-for="Password" data-valmsg-replace="true"></span>
                </div>

                <div class="editor-label">
                    <input data-val="true" data-val-required="The Remember me? field is required." id="RememberMe" name="RememberMe" type="checkbox" value="true" /><input name="RememberMe" type="hidden" value="false" />
                    <label for="RememberMe">Remember me?</label>
                </div>

                <p>
                    <input type="submit" value="Log On" />
                </p>
            </fieldset>
        </div>
    </form>
    </div>

</body>
</html>

For comparison this is the output of VS MVC template where client side validation is working:

    <!DOCTYPE html>
    <html>
    <head><title>

        Log On
        </title><link href="../Content/Site.css" rel="stylesheet" type="text/css" />
        <script src="/Scripts/jquery-1.4.4.min.js" type="text/javascript"></script>
    </head>
    <body>
        <div class="page">

            <div id="main">
        <script src="/Scripts/jquery.validate.min.js" type="text/javascript"></script>
        <script src="/Scripts/jquery.validate.unobtrusive.min.js" type="text/javascript"></script>

        <form action="/Account/LogOn" method="post">
            <div>
                <fieldset>
                    <legend>Account Information</legend>

                    <div class="editor-label">
                        <label for="UserName">User name</label>
                    </div>
                    <div class="editor-field">
                        <input data-val="true" data-val-required="The User name field is required." id="UserName" name="UserName" type="text" value="" />
                        <span class="field-validation-valid" data-valmsg-for="UserName" data-valmsg-replace="true"></span>
                    </div>

                    <div class="editor-label">
                        <label for="Password">Password</label>
                    </div>
                    <div class="editor-field">
                        <input data-val="true" data-val-required="The Password field is required." id="Password" name="Password" type="password" />
                        <span class="field-validation-valid" data-valmsg-for="Password" data-valmsg-replace="true"></span>
                    </div>

                    <div class="editor-label">
                        <input data-val="true" data-val-required="The Remember me? field is required." id="RememberMe" name="RememberMe" type="checkbox" value="true" /><input name="RememberMe" type="hidden" value="false" />
                        <label for="RememberMe">Remember me?</label>
                    </div>

                    <p>
                        <input type="submit" value="Log On" />
                    </p>
                </fieldset>
            </div>
        </form>
            </div>
        </div>
    </body>
    </html>

You need to add the following before the FORM begins:

<% Html.EnableClientValidation();%>   

Also, ensure you have this script referenced:

<script src="<%=Url.Content("~/Scripts/MicrosoftMvcJQueryValidation.js")%>" 

As well as jQuery itself.

The answer is: <script src="<%: Url.Content("~/Scripts/jquery-1.4.4.min.js") %>" type="text/javascript"></script> was not in my Master page header tag at first. When I added it it should work but it did not for next 4 hours.

Probably because Firefox kept showing me the old version with no reference to <script src="<%: Url.Content("~/Scripts/jquery-1.4.4.min.js") %>" type="text/javascript"></script> . Or... Accept goes to the only answer that is not mine there.

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