How do I instantiate the TerrainToolKit script?

I'm working on trying to create randomized terrains during runtime. I've used terrain toolkit before on unity 3, however, I was just messing around with the actual editor portion and did not delve into scripting. Now, I would like to call different terrain toolkit procedures onto my terrain but, when using the code off of their site (http://www.sixtimesnothing.com/perlin-generator/) i get that the PerlinGenerator function is not part of the UnityEngine.GameObject class. I believe i'm just missing something completely obvious. All I'm looking for is something like this:

 function OnGUI () 
 {
      if (GUI.Button(new Rect(0,0,100,100), "Generate!"))
      {
           var go : GameObject = GameObject.Find("Terrain");
           go.GetComponent("TerrainToolkit").PerlinGenerator( 4, 1.0, 8, 0.8 ); // This is straight off of their website...
      }
 }