if (document.images) {
  var first_off = new Image();
  first_off.src = "../Merchant2/assets/sfnt/2010/feb/02022010_off_r1_c1.jpg";
  var first_on = new Image();
  first_on.src = "../Merchant2/assets/sfnt/2010/feb/02022010_on_r1_c1.jpg";

  var second_off = new Image();
  second_off.src = "../Merchant2/assets/sfnt/2010/feb/02022010_off_r1_c2.jpg";
  var second_on = new Image();
  second_on.src = "../Merchant2/assets/sfnt/2010/feb/02022010_on_r1_c2.jpg";

  var third_off = new Image();
  third_off.src = "../Merchant2/assets/sfnt/2010/feb/02022010_off_r1_c3.jpg";
  var third_on = new Image();
  third_on.src = "../Merchant2/assets/sfnt/2010/feb/02022010_on_r1_c3.jpg";
  
  var fourth_off = new Image();
  fourth_off.src = "../Merchant2/assets/sfnt/2010/feb/02022010_off_r1_c4.jpg";
  var fourth_on = new Image();
  fourth_on.src = "../Merchant2/assets/sfnt/2010/feb/02022010_on_r1_c4.jpg";
}

function activate(imgName) {
  if (document.images) {
    if ( eval(imgName + "_on.complete") ) {
      document.images[imgName].src = eval(imgName + "_on.src");
    }
  }
}

function deactivate(imgName) {
  if (document.images) {
    if ( eval(imgName + "_off.complete") ) {
      document.images[imgName].src = eval(imgName + "_off.src");
    }
  }
}