@echo off
if not exist %0 goto ERROR
if not "%1"=="" goto %1

:MAIN
call %0 ECHOHI
call %0 ECHOBYE
goto DONE

:ECHOHI
echo Hi!
goto DONE

:ECHOBYE
echo Bye!
goto DONE

:ERROR
echo.
echo You must run this batch file with it's full name (including the extension).
echo If you run it from another directory, you must include the path as well. 
echo If you include the path, it should be the "short" path (or at least not 
echo include spaces). Running it by typing "%0" isn't good enough!
echo Double-clicking this batch file in Windows Explorer will work just fine...
echo.
goto DONE

:DONE
::  http://www.ericphelps.com