Move on mouse click in Orthografic 30x45x0 angle

Hi How to accomplis move on mouse click if Im using Orthgrafic camera and rotation x30, y45, z0 Im using this script but object flys like crazy on screen #pragma strict var smooth:int; // Determines how quickly object moves towards position var targetPosition:Vector3; var klik:Vector3; function Update () { if(Input.GetKeyDown(KeyCode.Mouse0)) { smooth=1; var playerPlane = new Plane(Vector3.up, transform.position); klik=Input.mousePosition; var ray = Camera.main.ScreenPointToRay (klik); //var x:float=klik.x; //var y:float=klik.y; //var z:float=klik.z;

               //klik.y=z;
               //klik.z=y;
               targetPosition = Camera.current.ScreenToWorldPoint (klik);
               var myWorldPoint : Vector3 = new Vector3(klik.x,0,klik.y); 
               
               var hitdist = 0.0;
               if (playerPlane.Raycast (ray, hitdist)) 
               {
                    var targetPoint = ray.GetPoint(hitdist);
                     //targetPosition = ray.GetPoint(hitdist);
                     var targetRotation = Quaternion.LookRotation(targetPoint - transform.position);
                     transform.rotation = targetRotation;
               }
             }          
             transform.position = Vector3.Slerp (transform.position, klik, Time.deltaTime * smooth);
          }
 function start()
 {
   var targetPosition = transform.position;
 }