svn multiple repositories checkout

The title of this post is what I am asking to Google without success...

My idea is to have something like a branch and merge but with two svns. I like to have a secondary repository. This means, for me, to have a checkout from the main one and work normally with the secondary.

Why not the same repository? Because I don't have write permissions on the main one to make this branch but I like to synchronize to that one doing something like a merge.

The solution could be some scripting to rename directories to simplify and automatize this task... Ideas?