image = new Array();

image[0] = new Image();
image[0].src = "img/roo_normal.jpg";
image[1] = new Image();
image[1].src = "img/roo_typea.jpg";
image[2] = new Image();
image[2].src = "img/roo_typeb.jpg";
image[3] = new Image();
image[3].src = "img/roo_typec.jpg";
image[4] = new Image();
image[4].src = "img/roo_typed.jpg";

function Img_2(n){
if(document.images){
document.link.src=image[n-1].src;}}