Checkbox

[fried]

Hello everyone. I need help please. I have a couple of checkboxes on my stage. The checkboxes(when checked) should add a number to a dynamic text box on the stage. This text box has a variable name “lblmaintotal”.
Is this possible?

Here is the code I used:

var lblmaintotal:Number;

lblmaintotal = 96908;

MPListener = new Object();
MPListener.click = function (){
if(MP.selected){
lblmaintotal = lblmaintotal + 2290;
}
else{
lblmaintotal = lblmaintotal;
}
}