function preloadimages() {
var imgdir = "img/";
box1 = new Image;box1.src = imgdir+"top.png";
box2 = new Image;box2.src = imgdir+"footer.png";
box3 = new Image;box3.src = imgdir+"left.png";
box4 = new Image;box4.src = imgdir+"right.png";
box5 = new Image;box5.src = imgdir+"bg2.gif";
box6 = new Image;box6.src = imgdir+"bg.gif";
box7 = new Image;box7.src = imgdir+"bg_scene.jpg";
box8 = new Image;box8.src = imgdir+"nbrdy.gif";
box9 = new Image;box9.src = imgdir+"flag_eng1.gif";
box10 = new Image;box10.src = imgdir+"flag_slo0.gif";
box11 = new Image;box11.src = imgdir+"sub_bg.gif";
}