Unity Controller Support Help

Hello Fellow friends and Unity peers!

I have a simple question for you guys.....

I have this script that uses the arrow keys instead of the Horizontal Input....

 #pragma strict
  
 var artex : Texture[];
  
 var uvAnimationTileX = 1; //Here you can place the number of columns of your sheet. 
                            //The above sheet has 24
  
 var uvAnimationTileY = 6; //Here you can place the number of rows of your sheet. 
                           //The above sheet has 1
 var framesPerSecond = 10.0;
  
 private var iTexture = 1;
 private var iNewTexture = 0;
  
 function Update () {
     if (artex.Length < 3) {
         Debug.Log("Need to assign textures in the inspector");
         return;
     }
  
     if (Input.GetKey(KeyCode.LeftArrow)) {
         iNewTexture = 0;
         uvAnimationTileX = 3;
         uvAnimationTileY = 1; 
     }
     else if (Input.GetKey(KeyCode.RightArrow)) {
         iNewTexture = 2;
          uvAnimationTileX = 3;
         uvAnimationTileY = 1; 
     }
     else {
         iNewTexture = 1;
           uvAnimationTileX = 1;
         uvAnimationTileY = 6; 
     }  
  
     if (iNewTexture != iTexture) {
         iTexture = iNewTexture;
         renderer.material.mainTexture = artex[iTexture];
     }
  
     // Calculate index
     var index : int = Time.time * framesPerSecond;
     // repeat when exhausting all frames
     index = index % (uvAnimationTileX * uvAnimationTileY);
  
     // Size of every tile
     var size = Vector2 (1.0 / uvAnimationTileX, 1.0 / uvAnimationTileY);
  
     // split into horizontal and vertical index
     var uIndex = index % uvAnimationTileX;
     var vIndex = index / uvAnimationTileX;
  
     // build offset
     // v coordinate is the bottom of the image in opengl so we need to invert.
     var offset = Vector2 (uIndex * size.x, 1.0 - size.y - vIndex * size.y);
  
     renderer.material.SetTextureOffset ("_MainTex", offset);
     renderer.material.SetTextureScale ("_MainTex", size);
 }

The xbox controller moves my player but this script does not work on it.... i need this script to use the Horizontal input instead of the arrow keys