function preloadimages() {
//var imgdir = "images/";
var imgdir = "images/";
box1 = new Image;box1.src = imgdir+"bg_top.gif";
box2 = new Image;box2.src = imgdir+"top.jpg";
box3 = new Image;box3.src = imgdir+"menu_right_bg.gif";
box4 = new Image;box4.src = imgdir+"menu_left_bg.gif";
box5 = new Image;box5.src = imgdir+"footer_bg.gif";
box6 = new Image;box6.src = imgdir+"footer_box.gif";
}