[development] a simple link as MENU_LOCAL_TASK

Hi everybody. I want to create a MENU_LOCAL_TASK link which simply links to 'node/add/mymodule' . I don't need callbacks or other. Simply send clicks on the little tab (created near view and edit) to the 'node/add/mymodule' page. How can I do this on drupal 4.7 ? This looks simple to me but I'm stuck with this! (maybe I'm too tired) Thanks Fabio