Making Cross Hair Show Red when over item tagged Enemy

I have the following code to create a cross hair and make it move when I press fire but is there any way I can make it so that it uses it exposed color area and changes red when over an item tagged Enemy?

MousePoint.js

 #pragma strict
 
 var drawCrosshair = true;
 
 var crosshairColor = Color.white;   //The crosshair color
 
 var width : float = 1;      //Crosshair width
 var height : float = 3;     //Crosshair height
 
 
 
 private var hit : RaycastHit;
 
 class spreading{
     var spread = 20.0;          //Adjust this for a bigger or smaller crosshair
     var maxSpread = 60.0;
     var minSpread = 20.0;
     var spreadPerSecond = 30.0;
     var decreasePerSecond = 25.0;
 }
 var spread : spreading;
 
 private var tex : Texture2D;
 
 private var newHeight : float;
 private var lineStyle : GUIStyle;
 
 function Awake (){
     tex = Texture2D(1,1);
     SetColor(tex,crosshairColor); //Set color
     lineStyle = GUIStyle();
     lineStyle.normal.background = tex;
     
 }
 
 function OnGUI (){
     var centerPoint = Vector2(Screen.width/2,Screen.height/2.5);
     var screenRatio : float = Screen.height/100;
 
     newHeight = height * screenRatio;
 
     if(drawCrosshair){
         GUI.Box(Rect(centerPoint.x-(width/2), centerPoint.y - ((newHeight-1) + spread.spread), width, newHeight),GUIContent.none,lineStyle);
         GUI.Box(Rect(centerPoint.x-(width/2), (centerPoint.y + spread.spread), width, newHeight),GUIContent.none,lineStyle);
         GUI.Box(Rect((centerPoint.x + spread.spread), (centerPoint.y - (width/2)), newHeight, width),GUIContent.none,lineStyle);
         GUI.Box(Rect(centerPoint.x- ((newHeight-1) + spread.spread), (centerPoint.y -(width/2)), newHeight, width),GUIContent.none,lineStyle);
     }
     if(Input.GetButton("Fire1"))
     {
         spread.spread += spread.spreadPerSecond * Time.deltaTime;       //Make spreading "smooth" and not abrupt
         Fire();
         
     }
 
     spread.spread -= spread.decreasePerSecond * Time.deltaTime;      //Decrement the spread
     spread.spread = Mathf.Clamp(spread.spread, spread.minSpread, spread.maxSpread);     
 }
 
 function Fire(){
     //Carry out your normal shooting and stuff
 }
 
 function SetColor(myTexture : Texture2D, myColor : Color){
     for (var y : int = 0; y < myTexture.height; ++y){
         for (var x : int = 0; x < myTexture.width; ++x){
             myTexture.SetPixel(x, y, myColor);
             }
         }
         myTexture.Apply();
     }