APEX

Hi people

I'm trying to offer navigation in my app with two-level tabs, but after many hours of clicking around, the only thing that I got was frustation.
I wanna show the following in every page:

----------------+
| Tab1 | Tab2 |
---------------------------------------
| page 11 | page 12 | page 13 | page 14 |
----------------------------------------+

Here I'm standing on some page between 11-14 and Tab1 is active.
If you click Tab2 you should go to page 21 and see something like this:

----------------+
| Tab1 | Tab2 |
-----------------------------
| page 21 | page 22 | page 23 |
------------------------------+

From here you should be able to go to pages 21-23
My application's page template default is already on Two Level Tabs.
I saw sample applications, but they use an One-level Tab for upper tabset and a List for lower level options.

Is this the only (or easy) way to do it?
Can someone tell me how to, using Two Level Tabs?


Thanks in advance
Oscar