if(document.images)
   {
   image01 = new Image;
   image02 = new Image;
   image11 = new Image;
   image12 = new Image;
   image21 = new Image;
   image22 = new Image;
   image31 = new Image;
   image32 = new Image;
   image41 = new Image;
   image42 = new Image;
   image51 = new Image;
   image52 = new Image;

   image01.src = "../img/navi/00/mn02.gif";
   image02.src = "../img/navi/01/mn02.gif";
   image11.src = "../img/navi/00/mn01.gif";
   image12.src = "../img/navi/01/mn01.gif";
   image21.src = "../img/navi/00/mn04.gif";
   image22.src = "../img/navi/01/mn04.gif";
   image31.src = "../img/navi/00/mn03.gif";
   image32.src = "../img/navi/01/mn03.gif";
   image41.src = "../img/navi/00/mn06.gif";
   image42.src = "../img/navi/01/mn06.gif";
   image51.src = "../img/navi/00/mn05.gif";
   image52.src = "../img/navi/01/mn05.gif";

   }

function swapOn(imgLocation) {
  if(document.images) {
    document.images[imgLocation].src = eval(imgLocation + "2.src");
  }
}

function swapOff(imgLocation) {
  if(document.images) {
    document.images[imgLocation].src = eval(imgLocation + "1.src");
  }
}