CS3 AS2 multiple conditionals

programming flash
1

Please i need help. I got 2 input txtboxes (num1_txt, num2_txt) that make a sum and show the result in a dynamic textbox (total_txt) im good till here. Now i want to show some message in another textbox (message_txt) depending on the result of the sum. I tried ifs, else ifs, switch/case but im amateur user in actionscript and think im using them wrong.

Here is my script:

function calculate()
{
    var _num1 = num1_txt.text != "" ? (Number(num1_txt.text)) : (0);
    var _num2 = num2_txt.text != "" ? (Number(num2_txt.text)) : (0);
    var _total = total_txt.text != "" ? (Number(total_txt.text)) : (0);
    var _myMessage = message_txt.text != "" ? (Number(message_txt.text)) : (0);
    
    total_txt.text = _num1 + _num2 != 0 ? (String(_num1 + _num2)) : ("");
    
//if--->
    /*if (_total<10.4) {
        message_txt.text="low";
    }
    else if (_total>=10.5) {
        message_txt.text="normal";
    }
    else if (_total>=20.5) {
        message_txt.text="high";
    }
    else if (_total>=30.5) {
        message_txt.text="extra!";
    }
    else message_txt.text="start";*/


//switch--->
    /*switch(_total)
        {
        case _total<10.4: message_txt.text="low";
           break;
        case _total>=10.5: message_txt.text="normal";
           break;
        case _total>=20.5: message_txt.text="high";
           break;
        case _total>=30.5: message_txt.text="extra!";
           break;
        default: message_txt.text="start";
            break;
        }*/
}
    
num1_txt.onChanged = function ()
{
    calculate();
};
num2_txt.onChanged = function ()
{
    calculate();
}

I hope someone can guide me :thumb2: