function newImage(arg) {
  if (document.images) {
    rslt = new Image();
    rslt.src = arg;
    return rslt;
  }
}

function changeImages() {
  if (document.images && (preloadFlag == true)) {
    for (var i=0; i<changeImages.arguments.length; i+=2) {
      document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
    }
  }
}

var preloadFlag = false;
function preloadImages() {
  if (document.images) {
    M_01_over = newImage("/ceng/hp/common/image/p_menu_80_o.gif");
    M_02_over = newImage("/ceng/hp/common/image/p_menu_116_o.gif");
    M_03_over = newImage("/ceng/hp/common/image/p_menu_116_o.gif");
    M_04_over = newImage("/ceng/hp/common/image/p_menu_116_o.gif");
    M_05_over = newImage("/ceng/hp/common/image/p_menu_116_o.gif");
    M_06_over = newImage("/ceng/hp/common/image/p_menu_116_o.gif");
    M_07_over = newImage("/ceng/hp/common/image/p_menu_80_o.gif");
    M_08_over = newImage("/ceng/hp/common/image/p_menu_116_o.gif");
    M_09_over = newImage("/ceng/hp/common/image/p_menu_116_o.gif");
    M_10_over = newImage("/ceng/hp/common/image/p_menu_116_o.gif");
    M_11_over = newImage("/ceng/hp/common/image/p_menu_116_o.gif");
    M_12_over = newImage("/ceng/hp/common/image/p_menu_116_o.gif");
    preloadFlag = true;
  }
}