Remove “Site Admin” footer link.

I am trying to remove the “Site Admin” link from the footer if the logged in user is only at “User” level, not an administrator.

If this can not be done, I would like to simply remove it. However, I would like the “Register” link to still show – I know these two functions are connected, but is there a way to do this somehow?

Any help would be greatly appreciated.

Thanks!