Left Click Once, Does An Action, Left Click Again, Does Another Action.,

Sorry for using c#. I am attaching code and example project :)

 using UnityEngine;
 using System.Collections;
 
 /// <summary>
 /// Mouse picker.
 /// Author: Matthew Mazan [Masterio]
 /// </summary>
 public class MousePicker : MonoBehaviour 
 {
     enum State
     {
         None = 0,
         Pick = 1,
         Drop = 2
     }
 
     private State _state = State.None;
     private GameObject _pickedObject;
     private Vector3 _spawn;                                    // keeps position before object pick
 
     public const float PICK_DISTANCE = 2f;                    // high of the pick
     public const float PICK_SPEED = 10f;                    // pick speed
     public const float DROP_SPEED = 10f;                    // drop speed
     public const string GROUND_LEAYER_NAME = "ground";        // ground layer name
 
 
     void Update()
     {
         // mouse listener
         if(Input.GetMouseButtonDown(0))
         {
             OnMouseClick();
         }
 
         // when object is picked up
         if(_state == State.Pick)
         {
             OnObjectPickUpdate();
         }
         else if(_state == State.Drop)
         {
             OnObjectDropUpdate();
         }
 
     }
 
     public void OnMouseClick()
     {
         // pickup
         if(_state == State.None)
         {
             if(CastOnObject())
             {
                 OnObjectPickEnter();
             }
         }
         // drop
         else if(_state == State.Pick)
         {
             _state = State.Drop;
         }
     }
 
     // f.e. turn off physics, change color, etc.
     private void OnObjectPickEnter()
     {
         _state = State.Pick;
 
         // use to get the y position
         _spawn = _pickedObject.transform.position;
 
         // change color
         MeshRenderer mr = _pickedObject.GetComponent<MeshRenderer>();
         mr.material.color = Color.red;
 
     }
 
     // f.e. turn on physics, change color, etc.
     private void OnObjectDropExit()
     {
         _state = State.None;
 
         // set equal position
         _pickedObject.transform.position = new Vector3(_pickedObject.transform.position.x, _spawn.y, _pickedObject.transform.position.z);
 
         // change color back
         MeshRenderer mr = _pickedObject.GetComponent<MeshRenderer>();
         mr.material.color = Color.white;
 
         // release object handler
         _pickedObject = null;
     }
 
     // f.e. assing the object position to the mouse cursor position.
     private void OnObjectPickUpdate()
     {
         // move object up
         _pickedObject.transform.position = Vector3.Lerp(_pickedObject.transform.position, new Vector3(_pickedObject.transform.position.x, _spawn.y + PICK_DISTANCE, _pickedObject.transform.position.z), Time.deltaTime * PICK_SPEED);
     
         // assing object to the mouse position [x, z only]
         RaycastHit hit;
         
         if(Physics.Raycast(Camera.main.ScreenPointToRay(Input.mousePosition), out hit, 100f, 1 << LayerMask.NameToLayer(GROUND_LEAYER_NAME)))        // you MUST cast on separated layer [iam using ground layer]
         {
             // slowly follow by cursor
             //_pickedObject.transform.position = Vector3.MoveToward(_pickedObject.transform.position, new Vector3(hit.point.x, _pickedObject.transform.position.y, hit.point.z), Time.deltaTime * 10f);
             // or
             // set cursor position
             _pickedObject.transform.position = new Vector3(hit.point.x, _pickedObject.transform.position.y, hit.point.z);
         }
     }
 
     // f.e. place object on map again.
     private void OnObjectDropUpdate()
     {
         // move object down
         _pickedObject.transform.position = Vector3.Lerp(_pickedObject.transform.position, new Vector3(_pickedObject.transform.position.x, _spawn.y, _pickedObject.transform.position.z), Time.deltaTime * DROP_SPEED);
 
         // exit if position y same as spawn y
         if(_pickedObject.transform.position.y <= _spawn.y + 0.1f)
            OnObjectDropExit();
     }
 
     private bool CastOnObject()
     {
         RaycastHit hit;
 
         if(Physics.Raycast(Camera.main.ScreenPointToRay(Input.mousePosition), out hit))        // should be casted on separated layer
         {
             // picks only pickable objects [you can add layer or tag checks, if layer is used then remove this "if" condition]
             if(hit.transform.gameObject.name.StartsWith("pickable_"))
             {
                 // temporary keep the object handler
                 _pickedObject = hit.transform.gameObject;
                 return true;
             }
         }
 
         return false;
     }
 
     public GameObject pickedObject 
     {
         get {
             return _pickedObject;
         }
     }
 
 }
 

Project: https://mega.nz/#!b4pBTbYY!ad4daavEQP1oHDXxFU02I7eA5LDMdFtEnZuEah4GSgk

 var onhand : Transform;
  
   function Update () {
  
  
   function OnMouseDown () {
 
 if(transform.parent==null){
 
      rigidbody.useGravity = false;
      rigidbody.constraints = RigidbodyConstraints.FreezePositionX | RigidbodyConstraints.FreezePositionZ | RigidbodyConstraints.FreezePositionY | RigidbodyConstraints.FreezeRotationX | RigidbodyConstraints.FreezeRotationZ | RigidbodyConstraints.FreezeRotationY;
       transform.position = onhand.position;
        transform.rotation = onhand.rotation;
       transform.parent = GameObject.Find("FPSController").transform;
       transform.parent = GameObject.Find("FirstPersonCharacter").transform;
      
 
  }else{
  
       transform.parent = null;
       rigidbody.useGravity = true;
       rigidbody.constraints = RigidbodyConstraints.None;
 
 }}}