[Tutor] How do I squish this bug?

[Joseph Quigley]

Traceback (most recent call last):
   File "C:\Python24\saved\Geek Dictionary\jargon_file.py", line 39, in 
-toplevel-
     main()
   File "C:\Python24\saved\Geek Dictionary\jargon_file.py", line 26, in main
     lobby.lobby()
   File "C:/Python24/saved/Geek Dictionary\lobby.py", line 51, in lobby
     import jargon_file
   File "C:\Python24\saved\Geek Dictionary\jargon_file.py", line 39, in 
-toplevel-
     main()
   File "C:\Python24\saved\Geek Dictionary\jargon_file.py", line 26, in main
     lobby.lobby()
   File "C:/Python24/saved/Geek Dictionary\lobby.py", line 52, in lobby
     main()
NameError: global name 'main' is not defined

Source code is here:

def lobby():
     print "The Lobby"
     while True:
         mode = raw_input('\nLobby>> ')
         if mode == "commands":
             commands()
         elif ((mode == "exit()") or ("exit" == mode) or ("bye" == mode)):
             print"\nThanks for using the Geek Dictionary!\n"
             time.sleep(2)
             raise SystemExit
         elif mode == "email":
             print
             print "     ", cv.prog_email
         elif mode == "cemail":
             print
             print "     ", cv.rcn_email
         elif mode == "site":
             print
             print "     ", cv.prog_site
         elif mode == "info":
             print "Version: ", cv.ver
             print "Created by", cv.rel_creator_nm, "( a.k.a", cv.creator, ")"
             print "Hope you are enjoying the program!"
             print "Thanks to whoever it was at IM 2005 for the idea!\n"
             print "Johny Lane is not part of Warmouth Studios"
         elif ((mode == "geeker()") or ("geeker" == mode)):
             print "Loading Geeker prompt...\n"
             #load the gkd prompt
             gkd.commands()
             gkd.geeker()
         elif ((mode == "jargon()") or ("jargon" == mode)):
             import jargon_file
             main()
         elif mode == "":
             print
         else:
             print "Command Error! Not a recognized command: " , mode
     return

and the other module is:

def main():
     while True:
         print """\nPlease note that you may see weird symbols while using 
the console when you run
this module. There are also some bugs when changing between The Lobby and the
Jargon File twice.\n"""
         print "\nThe Jargon File 4.4.7\n"
         print "Type 'ls' for a list of words in the Jargon File 4.4.7 or 
back() to go back to\nthe lobby. As usual, 'exit()' closes the whole program"
         prompt = raw_input(">> ")
         if prompt == "ls":
             print """       Type Q to go back to the prompt
(TM)
/dev/null
/me"""
         elif prompt == "back()":
             import lobby
             lobby.lobby()
         elif prompt == "exit()":
             raise SystemExit
         elif ((prompt == "(TM)") or (prompt == "(tm)")):
             print TM
         elif prompt == "/dev/null":
             print dev_null
         elif prompt == "/me":
             print backslash_me
         elif prompt == "0":
             print num0
         elif prompt == "1TBS":
             print num1TBS
main()

Why do I get the error:
   NameError: global name 'main' is not defined

when switching between the two module twice (ie: type: jargon	type:back() 
type:jargon	type:back()  )?

Thanks
	JQ