var bLink1 = new Image;
var bLink1over = new Image;
var bLink2 = new Image;
var bLink2over = new Image;

bLink1.src = "images/b_link_1.jpg";
bLink1over.src = "images/b_link_1o.jpg";
bLink2.src = "images/b_link_2.jpg";
bLink2over.src = "images/b_link_2o.jpg";