[Htaccess] Directory 'alias'

[i_love_domains]

I'm trying for some days to get a alias like directory fixed...

The structure is something like:

|- default
|   |- some
|   |- stuff  
|- lorem
|   |- some -> /default/some
|   |- stuff  -> /default/stuff
|- (*1)
|   |-(*2) -> /default/(*2)

Default is the really existing directory, lorem can be every name..
With other words, everything must be pointed (not forwarded) to the /default directory.

I can't get this fixed.
Is there someone that can help me?