public class Controls extends Actor
{
    GreenfootImage Controls;
    GreenfootImage Red_Controls;
    public void act() 
    {
         if (Greenfoot.mouseClicked(this))
         {
           Greenfoot.setWorld(new controlls());  
         }
         if (Greenfoot.mouseMoved(this))
         {
             setImage(Red_Controls);
         }
         else if(Greenfoot.mouseMoved(this)==false)
         {
             setImage(Controls);
         }
    } 
    public Controls()
    {
       Controls = new GreenfootImage("Controls.png");
       Red_Controls= new GreenfootImage("Red_Controls.png");
    }
}