i am using inbuild validation js but getting error...

<script src="../../Scripts/jquery-1.5.1.js" type="text/javascript"></script>
<script src="../../Scripts/jquery.validate.js" type="text/javascript"></script>

$().ready(function () {
          $("#frmLogin").validate({
               rules:
                   {
                       Email:
                           {
                               required: true,
                               email: true
                           },
                       Password:
                           {
                               required: true,
                               minlength: 6
                           }
                   },
               message:
                   {
                       Email:
                           {
                               required: "Email is required",
                               email : "Enter Valid Email id "
                           },
                       Password:
                           {
                               required: "Password is required",
                               minlength: 6
                           }
                   }
          });
      });

TypeError: $("#frmLogin").validate is not a function
[Break On This Error]

minlength: 6