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['i7'] = new Image();
onImgs['i1'].src = 'http://www.circuitford.com/img/en/menu_01_on.jpg';
onImgs['i2'].src = 'http://www.circuitford.com/img/en/menu_02_on.jpg';
onImgs['i3'].src = 'http://www.circuitford.com/img/en/menu_03_on.jpg';
onImgs['i4'].src = 'http://www.circuitford.com/img/en/menu_04_on.jpg';
onImgs['i5'].src = 'http://www.circuitford.com/img/en/menu_05_on.jpg';
onImgs['i6'].src = 'http://www.circuitford.com/img/en/menu_06_on.jpg';
onImgs['i7'].src = 'http://www.circuitford.com/img/en/menu_07_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['i5'] = new Image();
offImgs['i6'] = new Image();
offImgs['i7'] = new Image();
offImgs['i1'].src = 'http://www.circuitford.com/img/en/menu_01.jpg';
offImgs['i2'].src = 'http://www.circuitford.com/img/en/menu_02.jpg';
offImgs['i3'].src = 'http://www.circuitford.com/img/en/menu_03.jpg';
offImgs['i4'].src = 'http://www.circuitford.com/img/en/menu_04.jpg';
offImgs['i5'].src = 'http://www.circuitford.com/img/en/menu_05.jpg';
offImgs['i6'].src = 'http://www.circuitford.com/img/en/menu_06.jpg';
offImgs['i7'].src = 'http://www.circuitford.com/img/en/menu_07.jpg';

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