Problemer med JavaScript i wordpress plugin

Hej

Jeg er ved at flytte min side over på wordpress og har en funktion som jeg er ved at konvertere til et wordpress plugin, men jeg kan ikke få den til at overføre plugin stien til mit javascript(ajax) php kald.

selve pluginet

 <?php
 /*
 Plugin Name: Domain Checker
 Plugin URI: http://cube-it.dk
 Description: Whois search for domains.
 Version: 1.0
 Author: Jesper Have
 Author URI: http://Jdh.dk
 */
 
 error_reporting(E_ALL);
 add_action("widgets_init", array('domain_check', 'register'));
 class domain_check {
     function activate(){
         $data = array( 'title' => 'Domain seaech' /* ,'option2' => 55 */);
         if ( ! get_option('domain_check')){
             add_option('domain_check' , $data);
         } else {
             update_option('domain_check' , $data);
         }
     }
     function deactivate(){
         delete_option('domain_check');
     }
     function control(){
         $data = get_option('domain_check');
         ?>
         <p><label for="domain_check_title">Title:</label><input class="widefat" name="domain_check_title" type="text" value="<?php echo $data['title']; ?>" /></p>
         <?php
         if (isset($_POST['domain_check_title'])){
             $data['title'] = attribute_escape($_POST['domain_check_title']);
             update_option('domain_check', $data);
         }
     }
     function widget($args){
         function run_js(){
             // LOAD JS 
             wp_enqueue_script('domain_check', plugins_url('jq-code.js', __FILE__));
             // ADD SOM JS VARIABLES
             wp_localize_script( 'domain_chec', 'domain_chec_params', array(
                                     plugins_url('process.php', __FILE__) => "url"
             ) );
         }
         add_action( 'domain_check', 'run_js' );
         $data = get_option('domain_check');
         echo $args['before_widget'];
         echo $args['before_title'] . $data['title'] . $args['after_title'];
         ?>
         <form method="post" action="" id="form">
         <div style="display:inline;">
         <input type="text" autocomplete="off" id="Search" class="text-input-domain" name="domain"> 
         <input type="submit" id="Check-submit" class="button-domain" value="Søg">
         </div>
          </form>
         <div id="loading" style="display: none">Vent venligst...<img src="<?php print plugins_url('img/load.gif', __FILE__); ?>"></img></div>
         <div id="results" align="left"></div>
         <?php
         echo $args['after_widget'];
     }
     function register(){
         register_sidebar_widget('Domain check', array('domain_check', 'widget'));
         register_widget_control('Domain check', array('domain_check', 'control'));
     }
 }
 ?>

min jq-code.js

 $(document).ready(function() {
     
     var loading;
     var results;
     
     var form = document.getElementById('form');
     var loading = document.getElementById('loading');
     var results = document.getElementById('results');
     var plugin_url = domain_chec_params.url;
 
     $('#form').submit( function() {
 
         if($('#Search').val() == "")
         {alert('Indtast venlist et domænenavn');return false;}
         
         results.style.display = 'none';
         $('#results').html('');
         loading.style.display = 'inline';
         
         $.post(plugin_url.'?domain=' + escape($('#Search').val()),{
         }, function(response){
             
             results.style.display = 'block';
             $('#results').html(unescape(response));    
             loading.style.display = 'none';
         });
         
         return false;
     });
     
 });