ÿþbooknow = new Image();
booknow.src = "images/booknow.png";
promotions = new Image();
promotions.src = "images/promotions.png";
arrow_left = new Image();
arrow_left.src = "images/arrowl.png";
arrow_right = new Image();
arrow_right.src = "images/arrowr.png";
arrow_up = new Image();
arrow_up.src = "images/arrowu.png";
arrow_down = new Image();
arrow_down.src = "images/arrowd.png";
ok = new Image();
ok.src = "images/ok.png";
soundon = new Image();
soundon.src = "images/sound.png";
play = new Image();
play.src = "images/play.png";

booknowa = new Image();
booknowa.src = "images/booknowa.png";
promotionsa = new Image();
promotionsa.src = "images/promotionsa.png";
arrow_lefta = new Image();
arrow_lefta.src = "images/arrowla.png";
arrow_righta = new Image();
arrow_righta.src = "images/arrowra.png";
arrow_upa = new Image();
arrow_upa.src = "images/arrowua.png";
arrow_downa = new Image();
arrow_downa.src = "images/arrowda.png";
oka = new Image();
oka.src = "images/oka.png";
soundoff = new Image();
soundoff.src = "images/soundoff.png";
pause = new Image();
pause.src = "images/pause.png";

<!-- repeat the 4 lines above for any subsequent images. -->

function swap(){
if (document.images){
for (var x=0;
x<swap.arguments.length;
x+=2) {
document[swap.arguments[x]].src = eval(swap.arguments[x+1] + ".src");
}
}
}