// the back to home animated when the cursor is over it.
backhome_on  = new Image();   
backhome_off = new Image();
backhome_on.src  = '../images/backhome-on.jpg';
backhome_off.src = '../images/backhome-off.jpg';
function activate(image) {
      imagesrc = eval(image + '_on.src');
      document[image].src = imagesrc;
}
function deactivate(image) {
      imagesrc = eval(image + "_off.src");
      document[image].src = imagesrc;
}