img1over = new Image();
img1over.src = "img/n1over.gif";
img2over = new Image();
img2over.src = "img/n2over.gif";
img3over = new Image();
img3over.src = "img/n3over.gif";
img4over = new Image();
img4over.src = "img/n4over.gif";
img5over = new Image();
img5over.src = "img/n5over.gif";