How to enable/disable Javascript using a C# script?

Hi,

I am trying to enable a script (Texture_Tile_Animation,.js) which starts disabled using a C# script. I have tried;

 Options_screen.GetComponent<Texture_Tile_Animation>().enabled = true; // Not working
     
     and 
     
 Options_screen.GetComponent("Texture_Tile_Animation").enabled = true; // Gives error as does not recognise 'enabled'.

Any ideas?

The script is as follows;

 #pragma strict
 
 var uvAnimationTileX : int = 4;
 var uvAnimationTileY : int = 4;
 var framesPerSecond : float = 10.0;
 
 //var timeToLiveInSeconds : float = 1.0f;
 
 private var index : int;
 
 private var size : Vector2;
 private var offset : Vector2;
 
 private var uIndex : float;
 private var vIndex : float;
 
 
 function Start() 
 {
     DoTiling(); 
 }
 
 function DoTiling() 
 {
     //gameObject.renderer.enabled = true;
 
     while(true) 
     {
         // Calculate index
         index = Time.time * framesPerSecond;
         // repeat when exhausting all frames
         index = index % (uvAnimationTileX * uvAnimationTileY);
         
         // Size of every tile
         size = Vector2 (1.0 / uvAnimationTileX, 1.0 / uvAnimationTileY);
         
         // split into horizontal and vertical index
         uIndex = index % uvAnimationTileX;
         vIndex = index / uvAnimationTileX;
         
         // build offset
         // v coordinate is the bottom of the image in opengl so we need to invert.
         offset = Vector2 (uIndex * size.x, 1.0 - size.y - vIndex * size.y);
         
         renderer.material.SetTextureOffset ("_MainTex", offset);
         renderer.material.SetTextureScale ("_MainTex", size);    
         
         yield WaitForEndOfFrame();   
     }
 
 //    yield WaitForSeconds(timeToLiveInSeconds);
 
   //  HideShockwave();
  }
 
  /*
     function HideShockwave() 
     {
         gameObject.renderer.enabled = false;
 
         //Destroy(gameObject, timeToLiveInSeconds);
     }
 */

Thanks