Override controllers in Magento

>> I've described admin controller override in my previous post. You just need to change config.xml and controller page with this code :

                        <?xml version="1.0"?>
                        <config>
                            <modules>
                               <JR_Overridecontroller>
                                 <version>1.0.0</version>
                               </JR_Overridecontroller>
                             </modules>
                       
                            <frontend>
                              <routers>
                                <catalog><!-- Name of core module to be overridden  -->
                                  <args>
                                    <modules>
                                      <JR_Overridecontroller before="Mage_Catalog">JR_Overridecontroller_Catalog</JR_Overridecontroller><!-- Tell Magento to call our custom module before the Mage/Catalog module -->
                                    </modules>
                                  </args>
                                </catalog>
                              </routers>
                            </frontend>
                        </config>

and in your controller page :

                     <?php
                        include_once("Mage/Catalog/controllers/ProductController.php");
                        class JR_Overridecontroller_Catalog_ProductController extends Mage_Catalog_ProductController
                        {
                            public function editAction(){
                             
                                // Here is your overridden controller method.....
                             
                            }
                        }
                    ?>

You can override any controller with the help of this.....