GameObject follows mouse but need some delay!

Hey,

I using the code below to make the GameObject follow the mouse pointer, but the problem is, it's very instant! I want some delay in the object to start following the pointer. And maybe the object increases its speed eventually to follow the pointer. Here's the code:

Code (csharp):

1. var depth = 10;
2.  
3.  
4. function Start ()
5.  
6. {
7.  
8.      Screen.showCursor = false;
9.  
10. }
11.  
12.  
13. function Update ()
14.  
15. {
16.  
17.      var mousePos = Input.mousePosition;
18.  
19.      var wantedPos = Camera.main.ScreenToWorldPoint (Vector3 (mousePos.x, mousePos.y, depth));
20.  
21.      transform.position = wantedPos;
22.  
23. }

Can someone help me?