var level1 : GameObject;
var level2 : GameObject;
var level3 : GameObject;
var level4 : GameObject;

function Update () {
if(Input.GetKeyDown(KeyCode.V))
   level1.renderer.lightmapIndex = 0;
   level2.renderer.lightmapIndex = 0;
   level3.renderer.lightmapIndex = 0;
   level4.renderer.lightmapIndex = 0;

if(Input.GetKeyDown(KeyCode.B))
   level1.renderer.lightmapIndex = 255;
   level2.renderer.lightmapIndex = 255;
   level3.renderer.lightmapIndex = 255;
   level4.renderer.lightmapIndex = 255;

}