About Joomla 1.5…(or 1.0)

Is it possible to have menu items only show up under certain menu items on certain pages? For example…The page I am building will have 8 main menus (all in Spanish), including Red Riecken and Lectura. Is it possible to make it so that my sub-menus under Red Riecken (Estructura, Noticias, etc.) come up when you click Red Riecken and are on that page? And that my sub-menus for Lectura (guias, recursos, etc.) show up only on the Lectura page?

If it is possible…how is it done?

Thanks for any insight you can offer!
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