[lexa2000lexa]

Если я понял вас правильно, тогда вот:

this.createTextField("txt",998,300,100,30,20);
txt.text = 5;
txt.border = true;
this.createTextField("txt2",999,300,130,100,100);
txt2.text = 2;
 
 
this.createEmptyMovieClip("square_mc",this.getNextHighestDepth());
square_mc.beginFill(0xFF0000);
square_mc.moveTo(10,10);
square_mc.lineTo(160,10);
square_mc.lineTo(160,40);
square_mc.lineTo(10,40);
square_mc.endFill();
square_mc._x = square_mc._y=150;
 
score_var = txt2.text;//score_var=0
square_mc.onPress = function() {
	score_var = Number(txt.text) + Number(txt2.text);
	txt.text = score_var;
};