2D Portals

Hi, I'm working on a 2D Puzzle game with portals. I need to create portals that can send objects with specific tags through and have them keep there velocety and preferably there rotation. Similar to portals in "Portal". I have figured out a way to make portals in the 3D mode. Here are some code that I'm using for that. Please help me.

Code (csharp):

1. public class Portal : MonoBehaviour
2. {
3.  
4.     public GameObject otherEnd = null; // The other portal
5.     public bool isTeleporting = false;
6.  
7.     void OnTriggerExit(Collider c)
8.     {
9.         // Checking if the thig that entered can teleport
10.         if (c.tag == "Player" || c.tag == "Portabel")
11.         {
12.             if (!isTeleporting)
13.             {
14.                 otherEnd.GetComponent<Portal>().TeleportTo(c.gameObject);
15.             }
16.             isTeleporting = false;
17.         }
18.     }
19.  
20.     public void TeleportTo(GameObject g)
21.     {
22.         // Teleporting
23.         g.transform.position = transform.position - (transform.up*0.65f);
24.         g.rigidbody.velocity = transform.up * g.rigidbody.velocity.magnitude;
25.  
26.         isTeleporting = true;
27.     }
28.  
29. }
30.  

 

For starters can change those into 2D versions:
http://docs.unity3d.com/Documentation/ScriptReference/Collider2D.OnTriggerExit2D.html
http://docs.unity3d.com/Documentation/ScriptReference/Rigidbody2D-velocity.html