if (document.images) {
  image1on = new Image();
  image1on.src = "../graphics/navhomer.gif";

  image1off = new Image();
  image1off.src = "../graphics/navhome.gif";
  
  image2on = new Image();
  image2on.src = "../graphics/navaboutr.gif";

  image2off = new Image();
  image2off.src = "../graphics/navabout.gif";
  
  image3on = new Image();
  image3on.src = "../graphics/navgalleryr.gif";

  image3off = new Image();
  image3off.src = "../graphics/navgallery.gif";
  
  image4on = new Image();
  image4on.src = "../graphics/navdirectionsr.gif";

  image4off = new Image();
  image4off.src = "../graphics/navdirections.gif";
  
  image5on = new Image();
  image5on.src = "../graphics/navcontactr.gif";

  image5off = new Image();
  image5off.src = "../graphics/navcontact.gif";

  image6on = new Image();
  image6on.src = "../graphics/navpreviousr.gif";

  image6off = new Image();
  image6off.src = "../graphics/navprevious.gif";
  
  image7on = new Image();
  image7on.src = "../graphics/navnextr.gif";

  image7off = new Image();
  image7off.src = "../graphics/navnext.gif";
  
  image8on = new Image();
  image8on.src = "../graphics/navcloser.gif";

  image8off = new Image();
  image8off.src = "../graphics/navclose.gif";

  image9on = new Image();
  image9on.src = "../graphics/navmailcloser.gif";

  image9off = new Image();
  image9off.src = "../graphics/navmailclose.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");
  }
}