if (document.images) {
   img1 = new Image(); img1.src = "./../images/menu/tenkatori_menu_hover.gif";
   img2 = new Image(); img2.src = "./../images/menu/tenkatori_menu_hover.gif";
   img3 = new Image(); img3.src = "./../images/menu/main_menu1_1_hover.gif";
   img4 = new Image(); img4.src = "./../images/menu/main_menu2_1_hover.gif";
   img5 = new Image(); img5.src = "./../images/menu/main_menu3_1_hover.gif";
   img6 = new Image(); img6.src = "./../images/menu/main_menu4_1_hover.gif";
   img7 = new Image(); img7.src = "./../images/menu/main_menu5_1_hover.gif";
   
}

function setImage(img, image) {
   if (img) {
      img.src = image;
   }
}