MVC 2 Client side validation is not working

Question

Hi, I looked in all stack overflow threads, read all Scott guru posts, nothing helped me to solved the issue what am i do wrong? I've added the following js references :

<script src="/Scripts/jquery-1.4.1.min.js" type="text/javascript"></script>
<script src="/Scripts/jquery.validate.js" type="text/javascript"></script>
<script src="/Scripts/MicrosoftMvcJQueryValidation.js" type="text/javascript"></script>
<script src="/Scripts/MicrosoftAjax.js" type="text/javascript"></script>
<script src="/Scripts/MicrosoftMvcAjax.js" type="text/javascript"></script>

<% Html.EnableClientValidation(); %>
<% using (Html.BeginForm()) {%>
<%=Html.TextBoxFor(model => model.Email, new { style = "width:190px;Border:0px", maxsize = 190 })%>
<%=Html.ValidationMessageFor(model => model.Email)%>
<input type="image" src="/Content/Images/signbtn.png"  value="Email"/>
<%}%>

and this is just not working!! can anyone help? Thanks