if (document.images)
{
   home                 = new Image();
   home.src             = "images/home.jpg";
   homedown             = new Image();
   homedown.src         = "images/home_over.jpg";

   historyb               = new Image();
   historyb.src           = "images/history.jpg";
   historybdown           = new Image();
   historybdown.src       = "images/history_over.jpg";
   
   projects               = new Image();
   projects.src           = "images/projects.jpg";
   projectsdown           = new Image();
   projectsdown.src       = "images/projects_over.jpg";

   training               = new Image();
   training.src           = "images/training.jpg";
   trainingdown           = new Image();
   trainingdown.src       = "images/training_over.jpg";

   employees               = new Image();
   employees.src           = "images/employees.jpg";
   employeesdown           = new Image();
   employeesdown.src       = "images/employees_over.jpg";
   
   contact               = new Image();
   contact.src           = "images/contact.jpg";
   contactdown           = new Image();
   contactdown.src       = "images/contact_over.jpg";
}

function buttondown(bname)
{
    if (document.images)
        document[bname].src = eval(bname + "down.src");
}

function buttonup(bname)
{
    if (document.images)
        document[bname].src = eval(bname + ".src");
}