How Do I Create A Nested Function With Unity JavaScript?

I am trying to to create a radial menu function with multiple components to it but having some problems.

My Function looks like this and will display a radial menu when the middle mouse button is held down

 function RadialMenu ()
 {
     function Display ()
     {
         if (Input.GetButton("Activate Radial Menu"))
         {
             radialMenuBack.enabled = true;
         }
         else
         {
             radialMenuBack.enabled = !true;
         }
     }
     
     function Update ()
     {
         //code goes here
     }
 }

This throws compiler errors and won't work... I wasn't sure if I was just being retarded, probably am, so I copied and pasted the following code from here

 function person(firstname,lastname,age,eyecolor)
 {
 this.firstname=firstname;
 this.lastname=lastname;
 this.age=age;
 this.eyecolor=eyecolor;
 
 this.changeName=changeName;
 function changeName(name)
 {
 this.lastname=name;
 }
 }

This also throws compiler errors, and I'm not sure how to get this working.

Any help with this is appreciated. Thanks!