How can I reset the top header bar? How can I get reset the top header bar in blender? I accidentally used the corner grabbers in that header, and it created a duplicate menu.  

In the picture I've included, you can see that I now have 4 duplicates of this menu in a row.  The UI seems to reset itself if I open a new blender file, but I'd prefer to keep this particular blender file in clean, working order...
If you drag the corner of one onto the body of the next it will merge them back together.