var onImgs = new Array();
onImgs['i1'] = new Image();
onImgs['i2'] = new Image();
onImgs['i3'] = new Image();
onImgs['i4'] = new Image();
onImgs['i1'].src = '/img/en/menu_top_02_on.jpg';
onImgs['i2'].src = '/img/en/menu_top_03_on.jpg';
onImgs['i3'].src = '/img/en/menu_top_04_on.jpg';

function imgOn(imgName){
  if (document.images){
    document.images[imgName].style.cursor = 'pointer';
    document.images[imgName].src = onImgs[imgName].src;
  }
}

var offImgs = new Array();
offImgs['i1'] = new Image();
offImgs['i2'] = new Image();
offImgs['i3'] = new Image();
offImgs['i4'] = new Image();
offImgs['i1'].src = '/img/en/menu_top_02_off.jpg';
offImgs['i2'].src = '/img/en/menu_top_03_off.jpg';
offImgs['i3'].src = '/img/en/menu_top_04_off.jpg';
function imgOff(imgName){
  if (document.images){
    document.images[imgName].style.cursor = 'pointer';
    document.images[imgName].src = offImgs[imgName].src;
  }
}