function preload_images()
{

  image1on = new Image();
  image1on.src = "http://laspscc.org/images/nav_on-01-01.gif";

  image2on = new Image();
  image2on.src = "http://laspscc.org/images/nav_on-02-01.gif";

  image3on = new Image();
  image3on.src = "http://laspscc.org/images/nav_on-03-01.gif";

  image4on = new Image();
  image4on.src = "http://laspscc.org/images/nav_on-04-01.gif";

  image5on = new Image();
  image5on.src = "http://laspscc.org/images/nav_on-05-01.gif";

  image6on = new Image();
  image6on.src = "http://laspscc.org/images/nav_on-06-01.gif";

  image7on = new Image();
  image7on.src = "http://laspscc.org/images/nav_on-07-01.gif";

  image8on = new Image();
  image8on.src = "http://laspscc.org/images/nav_on-08-01.gif";

  image9on = new Image();
  image9on.src = "http://laspscc.org/images/nav_on-09-01.gif";

  image10on = new Image();
  image10on.src = "http://laspscc.org/images/nav_on-10-01.gif";
  
  image11on = new Image();
  image11on.src = "http://laspscc.org/images/nav_on_donate.gif";

  image1off = new Image();
  image1off.src = "http://laspscc.org/images/nav_off-01-01.gif";

  image2off = new Image();
  image2off.src = "http://laspscc.org/images/nav_off-02-01.gif";

  image3off = new Image();
  image3off.src = "http://laspscc.org/images/nav_off-03-01.gif";

  image4off = new Image();
  image4off.src = "http://laspscc.org/images/nav_off-04-01.gif";

  image5off = new Image();
  image5off.src = "http://laspscc.org/images/nav_off-05-01.gif";

  image6off = new Image();
  image6off.src = "http://laspscc.org/images/nav_off-06-01.gif";

  image7off = new Image();
  image7off.src = "http://laspscc.org/images/nav_off-07-01.gif";

  image8off = new Image();
  image8off.src = "http://laspscc.org/images/nav_off-08-01.gif";

  image9off = new Image();
  image9off.src = "http://laspscc.org/images/nav_off-09-01.gif";

  image10off = new Image();
  image10off.src = "http://laspscc.org/images/nav_off-10-01.gif";
  
  image11off = new Image();
  image11off.src = "http://laspscc.org/images/nav_off_donate.gif";
}

function turnOn(imagename) {
  if (document.images) {
    document[imagename].src = eval(imagename + "on.src");
  }
}

function turnOff(imagename) {
  if (document.images) {
    document[imagename].src = eval(imagename + "off.src");
  }
}