Im trying to get the second character in my party to change after a certian level and its not working with this script... also i would like to add and take away skills at the levels two, and i would like to change class of this character. can you help???

heres the script:
#----------------
# Level: Character Graphic Change
#----------------
class Scene_Map
# This is for aliasing the code to Scene_Map
alias levelgraphicchange_update update
def update

# $game_actors[ACTOR ID].level.between?(MIN LEVEL, MAX LEVEL)
if $game_actors[1].level.between?(6, 15)
# $game_party.actors[ACTOR ID].set_graphic("CHARSET FILE NAME", HUE, BATTLER, HUE)
$game_party.actors[0].set_graphic("002-Fighter02", 0, "002-Fighter02", 0)
# Update the graphic
$game_player.refresh
end

# $game_actors[ACTOR ID].level.between?(MIN LEVEL, MAX LEVEL)
if $game_actors[1].level.between?(16, 30)
# $game_party.actors[ACTOR ID].set_graphic("CHARSET FILE NAME", HUE, BATTLER, HUE)
$game_party.actors[0].set_graphic("003-Fighter03", 0, "002-Fighter02", 0)
# Update the graphic
$game_player.refresh
end

# $game_actors[ACTOR ID].level.between?(MIN LEVEL, MAX LEVEL)
if $game_actors[1].level.between?(31, 50)
# $game_party.actors[ACTOR ID].set_graphic("CHARSET FILE NAME", HUE, BATTLER, HUE)
$game_party.actors[0].set_graphic("004-Fighter04", 0, "002-Fighter02", 0)
# Update the graphic
$game_player.refresh
end

# $game_actors[ACTOR ID].level.between?(MIN LEVEL, MAX LEVEL)
if $game_actors[1].level.between?(51, 77)
# $game_party.actors[ACTOR ID].set_graphic("CHARSET FILE NAME", HUE, BATTLER, HUE)
$game_party.actors[0].set_graphic("005-Fighter05", 0, "002-Fighter02", 0)
# Update the graphic
$game_player.refresh
end
levelgraphicchange_update
end
end