Help optimize code

Hey, now i’ve got a code that looks like this:

b_1.btn_bg.onRelease = function(){
	if(_root.currMovie == "case"){
	b_1.btn_bg.enabled = false;
	b_2.btn_bg.enabled = true;
	b_2.initialState();
}

b_2.btn_bg.onRelease = function(){
	if(_root.currMovie == "case2"){
	b_2.btn_bg.enabled = false;
	b_1.btn_bg.enabled = true;
	b_1.initialState();
	
}

What it does is to check if the loaded movie is case1 etc…Then disables the b_1, enables
b_2 button, and runs initialState(); for each button enabled button.

I will have about 5 buttons, and it would be pretty much code to enable every button, and run initialState. How would you optimize it?