Movement and aiming based on Arrow keys and WASD?

Hello, I am currently working on a top-down shooter in which I want the player to be able to move with the WASD keys and to aim with the arrow keys. I am working in 2D space with a simple sprite. So far, I have the player movement, but not the aiming;

 #pragma strict
 
 var moveSpeed : float = 10F;
 
 function Start () {
 
 }
 
 function Update(){
     transform.Translate(Input.GetAxis("Horizontal") * moveSpeed * Time.deltaTime,Input.GetAxis("Vertical") * moveSpeed * Time.deltaTime,0);
 
 }

I want the player to point in the direction corresponding to the key that is pressed; ie. Right arrow pressed, faces right. (Yes, I am a MAJOR n00b at this, sorry.) Can anyone please help? Thanks!