[Zope] how to add pages to a new tab in plone

hope i get this through !!! In my plone site I've added a portal_tab through portal_actions. i've made a subfolder in my plone site root folder for it. I gave the path in the action value field of the tabs as : string:$portal_url/consumables now the problem is that when i click on my tab the index_html zpt opens seperately as a new page unlike the home tab's index page which opens inside the plone site . i want the pages in my tab to added as the plone site's content, not seperately. how do i do it. -- Share the vision of difference with ME