var onImgs = new Array();
onImgs['i1'] = new Image();
onImgs['i2'] = new Image();
onImgs['i3'] = new Image();
onImgs['i4'] = new Image();
onImgs['i5'] = new Image();
onImgs['i6'] = new Image();
onImgs['i1'].src = '/img/en/menu_top01_on.gif';
onImgs['i2'].src = '/img/en/menu_top02_on.gif';
onImgs['i3'].src = '/img/en/menu_top03_on.gif';
onImgs['i4'].src = '/img/en/menu_top04_on.gif';
onImgs['i5'].src = '/img/en/menu_top05_on.gif';
onImgs['i6'].src = '/img/en/menu_top06_on.gif';

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['i5'] = new Image();
offImgs['i6'] = new Image();
offImgs['i1'].src = '/img/en/menu_top01.gif';
offImgs['i2'].src = '/img/en/menu_top02.gif';
offImgs['i3'].src = '/img/en/menu_top03.gif';
offImgs['i4'].src = '/img/en/menu_top04.gif';
offImgs['i5'].src = '/img/en/menu_top05.gif';
offImgs['i6'].src = '/img/en/menu_top06.gif';

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