need help disable and enable objects

Questions & Answers
1

hello all i was wondering if there was a way to make a object show and to not show i no how to do this by mesh but i dont no how to make it objects

example 

var myMeshRenderer:MeshRenderer;
var myMeshRenderer1:MeshRenderer;
var myMeshRenderer2:MeshRenderer;
var myMeshRenderer3:MeshRenderer;

function OnGUI
{
if (GUI.Button (Rect(170, 185, 200, 100), aTexture3)) 
{
myMeshRenderer.enabled = false;
myMeshRenderer1.enabled = false;
myMeshRenderer2.enabled = false;
myMeshRenderer3.enabled = true;
}
}

is it posable to make somthing like this

var something : Transform;

Function Update ()
{
   if(Input.GetButtonDown("Fire1"))
   {
      something.enable = ture;
   }

   if(Input.GetButtonDown("Fire"))
   {
      something.enable = false;
   }
}
2

http://unity3d.com/support/documentation/ScriptReference/GameObject-active.html

3 
    gameObject.active = false;
    gameObject.renderer.enabled = false
4 
  var myMeshRenderer : GameObject;
  var myMeshRenderer1 : GameObject;
  var myMeshRenderer2 : GameObject;
  var myMeshRenderer3 : GameObject;

  var aTexture3 : Texture2D;

  function OnGUI()

   {

  if(GUI.Button (Rect(170, 185, 200, 100), aTexture3)) 
        {

   myMeshRenderer.active = false;
   myMeshRenderer1.active = false;
   myMeshRenderer2.active = false;
   myMeshRenderer3.active = true;
       }

       }