if (document.images) {

   img1 = new Image();
   img2 = new Image();
   img3 = new Image();
   img4 = new Image();
   img5 = new Image();
   img1.src = "photo/design_preview/photo_wedding_7504.jpg";
   img2.src = "img/wedding_book_1.png";
   img3.src = "img/wedding_book_2.png";
   img4.src = "img/wedding_book_3.png";
   img5.src = "img/wedding_book_4.png";

}