MVC3 Razor/JQuery Client side validation Not Works

I use ASP.NET MVC 3 Razor, with jquery validation plugin to build a Registration Form. So I included this:

<script src="@Url.Content("~/Scripts/jquery-1.4.4.js")" type="text/javascript"></script>
<script src="@Url.Content("~/Scripts/jquery.validate.js")" type="text/javascript">    </script>
<script src="@Url.Content("~/Scripts/jquery.validate.unobtrusive.js")" type="text/javascript"></script>

I've added the following in my Web.config:

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

My Razor form looks like this:

@model bop.Web.Models.ProfileModel

@{
    Layout = "~/Views/Shared/_Layout.cshtml";
}
<h2>Page title</h2>
@Html.ValidationSummary(true)
@using (Html.BeginForm("Register", "Profile", FormMethod.Post, new { id = "RegForm" }))
{
    <fieldset>
        <div class="editor-label">
            @Html.LabelFor(model => model.companyName)
        </div>
        <div class="editor-field">
            @Html.EditorFor(model => model.companyName)
            @Html.ValidationMessageFor(model => model.companyName)
        </div>
        <div>
        ... here other input fields ...
        </div>
        <a href="#" id="nextbtn1">GO TO STEP 2</a>
    </fieldset>

At the bottom I have:

<script type="text/javascript">
    $(document).ready(function () {
        $('#nextbtn1').click(function () { // bind click event to link
            $("#RegForm").valid开发者_如何学编程ate();
            if ($("#RegForm").valid()) {
                var $tabs = $('#tabs').tabs(); // first tab selected
                $tabs.tabs('select', 1); // select second tab
                return false;
            }
        }
    }
</script>

I use bind on the click event because my registration form is splitted across 3 tabs, so I'll perform a submit in the third step.

The problem is that when I click on "Go to step 2" button I get this error:

Run-time error in Microsoft JScript: Object does not support this property or method 'validate'

Much thanks in advance for helpful pointers.

Before checking if the form is valid, you must first validate it, so insert the following before the line if ($("#RegForm").valid()) {:

$("#RegForm").validate();