[chosen]

Hello I need some assistance with my class file. What I am doing is I have a quiz with different subjects in a combo box that the user can select (Math, chemistry, social studies..). What I want is to attach a separate class fiel for each subject that will display the problem and check the users anwer. Here is what I have so far, but its not working properly. My questions work fine within flash but when I use the class file it doesn't function. Thanks for your help.

Actionscript:

//This what I have modified to try to make it work in .as file
//Class Math ()
//This is variable set up to get the users infor
var youranswer:String;
function Math()
{
}
//This displays the question
private function displayequation()
{
	var myEquations:Array = [];
	var myOperators:Array = ["+", "-", "*", "/"];
	for (var i:Number = 0; i < 10; i++)
	{
		var num1:Number = Math.round((Math.random() * 50) + 1);
		var num2:Number = Math.round((Math.random() * 50) + 1);
		var randOp:Number = Math.round(Math.random() * (myOperators.length - 1));
		var temp:String = num1.toString() + " " + myOperators[randOp] + " " + num2.toString();
		//var temp:String = num1.toString() + myOperators[randOp] + num2.toString();
		trace("this is random string " + i + ": " + temp);
		myEquations.push(temp);
	}
	var currentEq:Number = 0;
	var setEquation:Function = function ()
	{
		eq_txt.text = myEquations[currentEq];
	};
	var checkFunction:Function = function ()
	{
		var ta:Array = myEquations[currentEq].split("");
		trace("here's ta: " + ta);
		var tmp:Number;
		switch (ta[1])
		{
		case "+" :
			trace("we're adding");
			tmp = parseInt(ta[0]) + parseInt(ta[2]);
			break;
		case "-" :
			trace("we're subtrating");
			tmp = parseInt(ta[0]) + parseInt(ta[2]);
			break;
		case "*" :
			trace("we're multiplying");
			tmp = parseInt(ta[0]) + parseInt(ta[2]);
			break;
		case "/" :
			trace("we're dividing");
			tmp = parseInt(ta[0]) + parseInt(ta[2]);
			break;
		}
		trace("and tmp is: " + tmp);
		if (tmp.toString() == ans_txt.text)
		{
			trace("Correct!");
			ans_txt.text = "";
			currentEq++;
			setEquation();
		}
		else
		{
			trace("wrong!");
		}
	};
}
setEquation();
check_mc.onRelease = checkFunction;