This is if you want to see your background image through the entry/navigation tables.
GLOBAL_HEAD<=
<=GLOBAL_HEAD
This will remove the background colors yet keep the borders, if you want the borders to be gone too use this override:
GLOBAL_HEAD<=
<=GLOBAL_HEAD
If you allready have a GLOBAL_HEAD override you will have to merge the two together in order for them to work correctly. Please see
this tutorial for how to do so.