base theme = bluemarine (or garland) does not work in .info file

Hey guys,

I am new to drupal and what I'm trying to do is to create a theme with bluemarine as base theme...Here's what I have in my oreo.info file (sites/all/themes/oreo)

; $Id$
name = Oreo
description = Oreo theme based on bluemarine
version = 1.0
core = 6.x
base theme = bluemarine

What I get is a messy website with no theme (see image attachment)...Am I doing something wrong?

Thanks in advance!