Toggle button help

use Input.GetButtonDown since it returns true only on the frame the button is pressed, not every frame while the button is pressed.

if (Input.GetButtonDown("Fire1")) {
    // Toggle code here
}

To make something invisible you can deactivate the gameObject

gameObject.active = false;

in a script gameObject refers to the game object that the script is attached to, which you don't want to do because it will stop scripts form executing on that game object and then you will only be able to toggle to false and then the script wont run. If you want to work with another game object you need to add a variable of type GameObject to the top of the script (outside all functions) like

var myGameObject : GameObject;

Then you'll need to link that property to the target game object in the inspector.

and a one liner for toggling true/false states:

myGameObject.active = !myGameObject.active;