<!-- Hide from older browsers

if (document.images) {
  var first_off = new Image();
  first_off.src = "images/off1.jpg";
  var first_on = new Image();
  first_on.src = "images/on1.jpg";

  var second_off = new Image();
  second_off.src = "images/off2.jpg";
  var second_on = new Image();
  second_on.src = "images/on2.jpg";

  var third_off = new Image();
  third_off.src = "images/off3.jpg";
  var third_on = new Image();
  third_on.src = "images/on3.jpg";
  
  var forth_off = new Image();
  forth_off.src = "images/off4.jpg";
  var forth_on = new Image();
  forth_on.src = "images/on4.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");
    }
  }
}

// End script hiding -->