fluxbox background

Integrate with fluxbox.
Everything works fine but the commands for updated the background are executed only in gnome or kde.
I made some minor changes to the code adding at line 451

            # If the user is running fluxbox
            elif os.popen( "ps --user " + os.environ.get( "USER" ) + "| gr
ep fluxbox" ).readline():
                cmd = "fbsetbg -c \"%s\" " % (output_img)
                os.popen(cmd)