Can someone check this code?

Question

What I am trying to achieve is an "active" button state. I
have six buttons. When one is clicked, i need it to change to a
color which denotes that it is the active button.
someone provided me with this code, but I can't seem to get
it to work. I followed the directions precisely.
The directions were as follows:
One thing I think you could do is create another invisible
layer of buttons above all your other buttons. You could make them
all invisible, unless a button is clicked.
Let's say your original layer of buttons is called a_but,
b_but, and c_but.
Then you could have another invisible layer of buttons called
invA_but, invB_but, and invC_but. This layer of buttons would each
be the color you want displayed while the button is selected. The
code would look something like-
invA_but._visible=false;
invB_but._visible=false;
invC_but._visible=false;
a_but.onRelease=function(){
invA_but._visible=true;
invB_but._visible=false;
invB_but._visible=false;
b_but.onRelease=function(){
invA_but._visible=false;
invB_but._visible=true;
invC_but._visible=false;
c_but.onRelease=function(){
invA_but._visible=false;
invB_but._visible=false;
invC_but._visible=true

Answer 1

invA_but, invB_but, and invC_but refer to instance names for
your buttons, not layer names as suggested in the description. It
should work if you have the instance names for the buttons right. I
would probably add code to make the nomal state invisible instead
of just having the active button covering the inactive one. EX:
a_but.onRelease=function(){
invA_but._visible=true; //show the buttons active state
a_but._visible = false; //hide the off state of the button
invB_but._visible=false; //hides the active state of button b
invC_but._visible=false; //hides the active state of button c