var material1 : Material;
var material2 : Material;
var material3 : Material;
var Player : GameObject;
var Level : String;

public var ScaleTo:Vector3 = Vector3(1.5,1.5,1.5);

private var OriginalScale:Vector3;
private var MasterOrigianlScale:Vector3;

function Start () {
GetComponent.().material = material1;
OriginalScale = transform.localScale;
MasterOrigianlScale = transform.localScale;
}

function OnMouseEnter()
{
GetComponent.().material = material2;
Player.GetComponent.().material = material3;
GetComponent.().Play();

iTween.Stop(gameObject);
iTween.ScaleTo(gameObject,{"scale":ScaleTo,"time":0.3,"loopType":iTween.LoopType.none});

var MasterScaleTo:Vector3 = Vector3(9,1,6);
iTween.Stop(Player.gameObject);
iTween.ScaleTo(Player.gameObject,{"scale":MasterScaleTo,"time":0.3,"loopType":iTween.LoopType.none});

}
function OnMouseExit () {
GetComponent.().material = material1;
iTween.Stop(gameObject);
iTween.ScaleTo(gameObject,OriginalScale,0.3);
iTween.Stop(Player.gameObject);

}

More information about public variables here: