Camera Swap Script

I am getting a compile error…have I missed something. Much appreciated. I’m obviously not a coder.
Assets/camera_script_nw.js(4,11): BCE0044: expecting (, found ‘Start’.

var main_Camera : Camera;

var Camera_2 : Camera;

-function Start(){
main_Camera.enabled = true;
Camera_2.enabled = false;

}

-function Update (){
if(Input.GetKeyUp(“1”)){
main_Camera.enabled = true;
Camera_2.enabled = false;

}

if(Input.GetKeyUp(“2”)){
main_Camera.enabled = false;
Camera_2.enabled = true;

}

}

Your Start function is missing a bracket. Always properly format code, that way you can catch errors like this easily.