if (document.images)   {
     image1on = new Image();
     image1on.src="/img/nav2b.jpg";

     image1off = new Image();
     image1off.src = "/img/nav2a.jpg";

}

if (document.images)   {
     image2on = new Image();
     image2on.src="/img/nav3b.jpg";

     image2off = new Image();
     image2off.src = "/img/nav3a.jpg";

}

if (document.images)   {
     image3on = new Image();
     image3on.src="/img/nav4b.jpg";

     image3off = new Image();
     image3off.src = "/img/nav4a.jpg";

}

if (document.images)   {
     image4on = new Image();
     image4on.src="/img/nav5b.jpg";

     image4off = new Image();
     image4off.src = "/img/nav5a.jpg";

}

if (document.images)   {
     image5on = new Image();
     image5on.src="/img/nav6b.jpg";

     image5off = new Image();
     image5off.src = "/img/nav6a.jpg";

}

if (document.images)   {
     image6on = new Image();
     image6on.src="/img/nav7b.jpg";

     image6off = new Image();
     image6off.src = "/img/nav7a.jpg";

}

if (document.images)   {
     image8on = new Image();
     image8on.src="/img/portbutton1a.jpg";

     image8off = new Image();
     image8off.src = "/img/portbutton1.jpg";

}

if (document.images)   {
     image9on = new Image();
     image9on.src="/img/portbutton2a.jpg";

     image9off = new Image();
     image9off.src = "/img/portbutton2.jpg";

}

if (document.images)   {
     image10on = new Image();
     image10on.src="/img/portbutton3a.jpg";

     image10off = new Image();
     image10off.src = "/img/portbutton3.jpg";

}

if (document.images)   {
     image11on = new Image();
     image11on.src="/img/portbutton4a.jpg";

     image11off = new Image();
     image11off.src = "/img/portbutton4.jpg";

}

if (document.images)   {
     image12on = new Image();
     image12on.src="/img/portbutton5a.jpg";

     image12off = new Image();
     image12off.src = "/img/portbutton5.jpg";

}

if (document.images)   {
     image13on = new Image();
     image13on.src="/img/portbutton6a.jpg";

     image13off = new Image();
     image13off.src = "/img/portbutton6.jpg";

}

if (document.images)   {
     image14on = new Image();
     image14on.src="/img/portbutton7a.jpg";

     image14off = new Image();
     image14off.src = "/img/portbutton7.jpg";

}

if (document.images)   {
     image15on = new Image();
     image15on.src="/img/portbutton8a.jpg";

     image15off = new Image();
     image15off.src = "/img/portbutton8.jpg";

}

if (document.images)   {
     image16on = new Image();
     image16on.src="/img/portbutton9a.jpg";

     image16off = new Image();
     image16off.src = "/img/portbutton9.jpg";

}

if (document.images)   {
     image17on = new Image();
     image17on.src="/img/portbutton10a.jpg";

     image17off = new Image();
     image17off.src = "/img/portbutton10.jpg";

}

if (document.images)   {
     image18on = new Image();
     image18on.src="/img/portbutton11a.jpg";

     image18off = new Image();
     image18off.src = "/img/portbutton11.jpg";

}

if (document.images)   {
     image19on = new Image();
     image19on.src="/img/portbutton12a.jpg";

     image19off = new Image();
     image19off.src = "/img/portbutton12.jpg";

}

if (document.images)   {
     image20on = new Image();
     image20on.src="/img/return2a.jpg";

     image20off = new Image();
     image20off.src = "/img/return2.jpg";

}



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");
     }
}