if (document.images) {
   img1 = new Image(); img1.src = "imgs/fbt-special.jpg";
   img2 = new Image(); img2.src = "imgs/bt-set.jpg";
   img3 = new Image(); img3.src = "imgs/bt-noodle.jpg";
   img4 = new Image(); img4.src = "imgs/bt-italian.jpg";
   img5 = new Image(); img5.src = "imgs/bt-rice.jpg";
   img6 = new Image(); img6.src = "imgs/bt-alacarte.jpg";
   img7 = new Image(); img7.src = "imgs/bt-dessert.jpg";
   img8 = new Image(); img8.src = "imgs/bt-drink.jpg";
}
function setImage(img, image) {
   if (img) {
      img.src = image;
   }
}