function newImage(arg)
{
  if (document.images)
  {
    rslt = new Image();
    rslt.src = arg;
    return rslt;
  }
}

function changeImages()
{
  if (document.images && (preloadFlag == true))
  {
    for (var i=0; i<changeImages.arguments.length; i+=2)
    {
      document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
    }
  }
}

var preloadFlag = false;
function preloadImages()
{
  if (document.images)
  {
    menu_home_over = newImage("images/menu_o_home.jpg");
    menu_files_over = newImage("images/menu_o_files.jpg");
    menu_media_over = newImage("images/menu_o_media.jpg");
    menu_info_over = newImage("images/menu_o_info.jpg");
    menu_team_over = newImage("images/menu_o_team.jpg");
    menu_contact_over = newImage("images/menu_o_contact.jpg");
    menu_shoutbox_over = newImage("images/menu_o_shoutbox.jpg");
    preloadFlag = true;
  }
}