Rails - Mar 2012 - jquery validation function not working properly with rails 3.2.1

I''m using Rails -3.2.1. In one of my form I''m using jquery
validation.
My form is below

----------------------------------------------------------------------
new_account.html.erb

<%= form_for(@account, :url =>{:action=> "create_account"})
do |f| %>

<table width="80%" border="1" align="center"
cellpadding="5"
cellspacing="5">
  <tr>
      <td width="30%">
      <%= f.label :Account_Name, :class => :style1_bold %>
      </td>
      <td>
      <%= f.text_field :account_name, :class =>"input_border required
ONLY_ALPHABET" %>
      </td>
      </tr>
    <tr>
        <td>
            &nbsp;
        </td>
        <td>
       <%=f.submit "Add Account" %>
       <%= link_to "Cancel", home_path,
:class=>"style2_link" %>
            </td>
            </tr>
        </table>
        <% end %>
----------------------------------------------------------------------
In application.js

    //= require jquery
    //= require jquery_ujs
    // require_tree .
    //= require_directory .

        jQuery.noConflict();
        jQuery(document).ready(function(){



          /////////////////////////////////////////////
            //// Validatior for only alphabet
            /////////////////////////////////////////////
           
jQuery.validator.addMethod("ONLY_ALPHABET",function(value,element){
                return this.optional(element) || /^[a-zA-Z
]+$/.test(value);
            },"Only Alphabet is allowed");

          /////////////////////////////////////////////
            //// Validation for Create Account
            /////////////////////////////////////////////
            jQuery("#new_account").validate(
            {
                  rules: {
                    account_account_name: {
                        required: true,
                ONLY_ALPHABET: true,
                        maxlength: 30
                    }
                },
                messages: {
                    account_account_name: {
                        required: "Please fill category",
                        ONLY_ALPHABET: "Only Alphabet is allowed",
                        maxlength: "Not more than 30 characters"
                    }
                }
            });

        });
----------------------------------------------------------------------
On Form submit. It doesn''t show my message instead it show jquery
default messages.

I include this file jquery.validate.min.js

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