C# to UnityScript conversion help.

So I am trying to translate a A* path finding script(a part of it at least) to UnityScript. I have gotten it to run without errors, but not run correctly. I is supposed to make a grid covering the area of the cube(in my case it is an invisible square covering my level. To test out if it works before continuing on, I made it so that it instantiates cubes. It ended up making four rows of stair-like figures. Can you guys please look at my code and tell me what I am missing?

http://puu.sh/2AZuk http://puu.sh/2AZuQ

Mine:

 class GridCell
 {
 var cellWalkable: boolean;
 var cellHeight: float;
 
 //Width and height of the map (in cells)
 var mapWidth: int;
 var mapHeight: int;
 }
 
 var cellSize: float = 0.5;
 var bounds: Bounds;
 var topLeftCorner: Vector3;
 
 //Map of the world
 var gridCells = new Array();
 
 var square: GameObject;
 
 function Start () 
 {
 
         bounds = renderer.bounds;
 
 
 }
 
 function Update () 
 {
 //Scans the bounds of the model, then creates a grid
     //Finds the top left corner
     topLeftCorner = bounds.center - bounds.extents + Vector3(0, bounds.size.y, 0);
     
     //creates the grid map
      var cells = GridCell();
     
     //Calculates the dimensions of the grid map.
     cells.mapWidth = Mathf.RoundToInt(bounds.size.x / cellSize);
     cells.mapHeight = Mathf.RoundToInt(bounds.size.y / cellSize);
     //Scans for walkable terrain in each cell
     for(var x = 0; x < cells.mapWidth; x++)
     {
         for(var y = 0; y < cells.mapHeight; y++)
         {
             //Gets the position for a ray
             var currentPosition = topLeftCorner + Vector3(x * cellSize, 0, y * cellSize);
             var hit: RaycastHit;
             //Creates a cell for the grid
             var cell = new GridCell();
             
             //Cast the ray
             if(Physics.Raycast(currentPosition, Vector3(0, -1, 0),hit, bounds.size.y))
             {
                 //the height of the highest item in the cell
                 cell.mapHeight = hit.point.y;
                 //Test if the hitpoint is walkable
                 Instantiate(square, hit.point, Quaternion.Euler(0,0,0));
                 if(((1 < hit.collider.gameObject.layer) /*&& walkableLayer*/) !=0)
                 {
                     //Flag the cell we hit as walkable
                     cell.cellWalkable = true;
                 }
             }
         }
         
     }
 
 }

His: He has a site that he posted this on http://unitygems.com/astar-1-journeys-start-single-step/ To be more specific it is the part in this picture. http://puu.sh/2AZCy

THANK YOU!