image1 = new Image();
image1.src = "../images/nav_b_01.gif";
image2 = new Image();
image2.src = "../images/nav_b_02.gif";
image3 = new Image();
image3.src = "../images/nav_b_03.gif";
image4 = new Image();
image4.src = "../images/nav_b_04.gif";
image5 = new Image();
image5.src = "../images/nav_b_05.gif";