//Preload Background images and mouse over images
    image1=new Image(94,100);
    image2=new Image(94,100);
    image3=new Image(94,100);
    image4=new Image(94,100);
    image1.src="images/home-mastectomy-over.jpg";
    image2.src="images/home-nursing-over.jpg";
    image3.src="images/home-stockings-over.jpg";
    image4.src="images/home-other-over.jpg";