Namespace problem | GameDev.net

I''m trying to convert a class to a namespace (no need to have it as a class) and I''ve ran into a wall. I''m attempting to stick with the normal definitions in the header and the actual function code in the source file. I split it up as I though was right, but it complains about the symbols being already defined in the other objects. in header file:

  
#ifndef WINDOWMANAGER
#define WINDOWMANAGER
namespace WindowManager
{
   bool fullscreen;
   void dosomething();
}
#endif

in the source file:

  
#include "WindowManager.h"
namespace WindowManager
{
   void dosomething()
   {
      fullscreen = false;
   }
}

What am I doing wrong?

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