// rollover functions
var rollovers = new Array;

function preload_image (ref, image) {
  rollovers[ref]           = new Image;
  rollovers[ref].src       = image + "_a.gif";
  rollovers[ref + "2"]     = new Image;
  rollovers[ref + "2"].src = image + "_b.gif";
}

function roll_over (ref) {
  document.images[ref].src = rollovers[ref + "2"].src;
}

function roll_out (ref) {
  document.images[ref].src = rollovers[ref].src;
}


// drop menu redirect
function drop_menu_redirect (menu) {
  var page = menu.options[menu.selectedIndex].value;

  if (page) {
    document.location.href = page;
  }
}


// popup functions
function open_popup (ref, url, width, height, scroll, menu, toolbar, location, status, resize) {
  window.open(url,
              ref,
              "menubar="    + ((menu) ? 'yes' : 'no')  + ", " +
              "scrollbars=" + ((scroll) ? 'yes' : 'no')  + ", " +
              "toolbar="    + ((toolbar) ? 'yes' : 'no')  + ", " +
              "status="     + ((status) ? 'yes' : 'no')  + ", " +
              "location="   + ((location) ? 'yes' : 'no')  + ", " +
              "resizable="  + ((resize) ? 'yes' : 'no')  + ", " +
              "width=" + width + ", height=" + height
             );
}