var roll_on  = new Array();
var roll_off = new Array();
function initialize_images(name, count, type) {
  button_list = new Array('aboutus', 'services', 'tools', 'management', 'contact', 'careers');
  var counter = 0;
  while (counter < button_list.length) {
    roll_off[button_list[counter]] = new Image;
    roll_off[button_list[counter]].src = 'images/nav/'+page_type+'/'+button_list[counter]+'_off.gif';
    roll_on[button_list[counter]] = new Image;
    roll_on[button_list[counter]].src = 'images/nav/'+page_type+'/'+button_list[counter]+'_on.gif';
    counter++;
  }
}

initialize_images();

function hi_lite(image_name) {
  var our_image = document.images[image_name];
  our_image.src = roll_on[image_name].src;
}

function darken(image_name) {
  // window.alert(roll_off['botnav1']);
  var our_image = document.images[image_name];
  our_image.src = roll_off[image_name].src;
}