Paul,
I asked a similar question [1]. I suspect their is a bug because the action is not called when the menu item is clicked. I do not think you want the action called when the menu item is generated, which would occur when the EL is evaluated.
Thank you for your reply. I found the answer: a tag <input type="hidden" name="jscook_action" />is needed before the jscookmenu one. I still have some issues with the menu styles, but it works.
Pierre