script starts
   if no arguements
      print 1st page of guestbook
      exit
   else
     is arguement 'next page'?
        print page N
        build next page button with 
        values for next page
     is argument 'previous page'?
        same as above but in reverse :)
     is argument 'add entry'?
        parse user entry and concatonate
         to end of guestbook file
script ends