Personally I prefer using hash map/Dictionary to handle name/value pairs like these. So your code could be written as:
var buttonMap:Dictionary = new Dictionary();
buttonMap["TD_g"] = "Tweedlee_Dee";
buttonMap["s_g"] = "Sincerely";
buttonMap["ats_g"] = "Ain’_that_a_shame";
buttonMap["iyk_g"] = "I_hear_you_knocking";
buttonMap["hms_g"] = "Hearts_made_of_stone";
buttonMap["tf_g"] = "Tutti_fruiti";
buttonMap["hd_g"] = "Hound_Dog";
buttonMap["ld_g"] = "Little_darlin";
buttonMap["ll_g"] = "Louie_Louie";
buttonMap["ts_g"] = "Twist_and_shout";
buttonMap["ipsy_g"] = "I_put_a_spell_on_you";
buttonMap["ysm_g"] = "You_shook_me";
buttonMap["ihm_g"] = "I_can_hear_music";
buttonMap["iss_g"] = "I_shot_the_sheriff";
buttonMap["tl_g"] = "Tainted_love";
TD_g.addEventListener(MouseEvent.MOUSE_DOWN, mouseDownHandler);
s_g.addEventListener(MouseEvent.MOUSE_DOWN, mouseDownHandler);
ats_g.addEventListener(MouseEvent.MOUSE_DOWN, mouseDownHandler);
iyk_g.addEventListener(MouseEvent.MOUSE_DOWN, mouseDownHandler);
hms_g.addEventListener(MouseEvent.MOUSE_DOWN, mouseDownHandler);
tf_g.addEventListener(MouseEvent.MOUSE_DOWN, mouseDownHandler);
hd_g.addEventListener(MouseEvent.MOUSE_DOWN, mouseDownHandler);
ld_g.addEventListener(MouseEvent.MOUSE_DOWN, mouseDownHandler);
ll_g.addEventListener(MouseEvent.MOUSE_DOWN, mouseDownHandler);
ts_g.addEventListener(MouseEvent.MOUSE_DOWN, mouseDownHandler);
ipsy_g.addEventListener(MouseEvent.MOUSE_DOWN, mouseDownHandler);
ysm_g.addEventListener(MouseEvent.MOUSE_DOWN, mouseDownHandler);
ihm_g.addEventListener(MouseEvent.MOUSE_DOWN, mouseDownHandler);
iss_g.addEventListener(MouseEvent.MOUSE_DOWN, mouseDownHandler);
tl_g.addEventListener(MouseEvent.MOUSE_DOWN, mouseDownHandler);
function mouseDownHandler(event:MouseEvent):void {
gotoAndStop(1, buttonMap[event.currentTarget.name]);
}
Still that doesn't solve your problem. The error says you have function mouseDownHandler
defined somewhere else in your code. Click on the lines with the errors in compiler errors and find the duplicate code. Comment it for now then figure out why it was copy/pasted in the first place and improve/fix that. HTH