var state = 'none';
var oldState;
home_on = new Image(85,33)
home_on.src = "/images/home_on.jpg"
home = new Image(85,33)
home.src = "/images/home.jpg"
company_on = new Image(85,33)
company_on.src = "/images/company_on.jpg"
company = new Image(85,33)
company.src = "/images/company.jpg"
services_on = new Image(85,33)
services_on.src = "/images/services_on.jpg"
services = new Image(85,33)
services.src = "/images/services.jpg"
contact_on = new Image(85,33)
contact_on.src = "/images/contact_on.jpg"
contact = new Image(85,33)
contact.src = "/images/contact.jpg"

function imgOn(imageName) {
  document[imageName].src = eval(imageName + "_on.src");
  return true;
}

function imgOff(imageName) {
  if (state == imageName) {
    document[imageName].src = eval(imageName + "_on.src");
  } else {
    document[imageName].src = eval(imageName + ".src");
  }
  return true;
}