How do i need to change this script for mobile?

[RANDOMGames]

This is a script for collecting pages like in slender. The problem is that i wan’t to make this for android and i don’t know how to, can anybody help? (it’s java script just if you don’t know)

@script RequireComponent ( AudioSource )
var papers : int = 0; 
var papersToWin = 5; 
var distanceToPaper : float = 2.5; 
public var paperPickup : AudioClip; 

function Start () 
{ 
	Screen.lockCursor = true; 
} 

function Update () 
{ 
	if(Input.GetMouseButtonDown (0) || Input.GetKeyDown (KeyCode.E)) 
	{ 
		var ray = Camera.main.ScreenPointToRay(Vector3(Screen.width * 0.5, Screen.height * 0.5, 0.0)); 
		var hit : RaycastHit; 
	
		if(Physics.Raycast(ray, hit, distanceToPaper)) 
		{ 
			if(hit.collider.gameObject.name == "Paper") 
			{ 
				papers += 1; audio.PlayClipAtPoint(paperPickup, transform.position); 
				Destroy(hit.collider.gameObject); 
			} 
		} 
	} 
}
 
function OnGUI () 
{ 
	if(papers < papersToWin) 
	{ 
		GUI.Box(Rect((Screen.width * 0.5) -60, 10, 120, 25), " " + papers.ToString() + " papers");
	} 
	
	else 
		GUI.Box(Rect((Screen.width/2) - 100, 10, 200, 35), "All Papers Collected!"); 
}

[meat5000]

Take out key commands and mouse events and replace with Touch Handler. Check Penelope iPhone tutorials and also check out the AngryBots demo in android build; the Joystick prefab handles touches and is worth a look.