home_on = new Image();
home_on.src = 'images/homeRo_on.gif';
home_off = new Image();
home_off.src = 'images/homeRo_off.gif';

about_on = new Image();
about_on.src = 'images/aboutRo_on.gif';
about_off = new Image();
about_off.src = 'images/aboutRo_off.gif';

absist_on = new Image();
absist_on.src = 'images/absistRo_on.gif';
absist_off = new Image();
absist_off.src = 'images/absistRo_off.gif';

consulting_on = new Image();
consulting_on.src = 'images/consultingRo_on.gif';
consulting_off = new Image();
consulting_off.src = 'images/consultingRo_off.gif';

training_on = new Image();
training_on.src = 'images/training_on.gif';
training_off = new Image();
training_off.src = 'images/training_off.gif';

exp_on = new Image();
exp_on.src = 'images/expRo_on.gif';
exp_off = new Image();
exp_off.src = 'images/expRo_off.gif';

clients_on = new Image();
clients_on.src = 'images/clientsRo_on.gif';
clients_off = new Image();
clients_off.src = 'images/clientsRo_off.gif';

contact_on = new Image();
contact_on.src = 'images/contact_on.gif';
contact_off = new Image();
contact_off.src = 'images/contact_off.gif';

function imgon (image) {
      my_image = eval(image + '_on.src');
      document[image].src = my_image;
}

function imgoff (image) {
      my_image = eval(image + '_off.src');
      document[image].src = my_image;
}