/* preload images */

var menuImg = new Array(8);

for (i = 0; i <= 8; i++) {
    menuImg[i] = new Image();
    menuImg[i].src = "data/images/menu/main_bw_" + (i + 1) + ".jpg";
  }

var menuImgOn = new Array(8);

for (i = 0; i <= 8; i++) {
    menuImgOn[i] = new Image();
    menuImgOn[i].src = "data/images/menu/main_col_" + (i + 1) + ".jpg";
  }


/* switch images, status bar info */

function switchOn(img) {
    document.images[img-1].src = "data/images/menu/main_col_" + img + ".jpg";
  }

function switchOff(img) {
    document.images[img-1].src = "data/images/menu/main_bw_" + img + ".jpg";
  }