if (document) 
{image1on = new Image(); image1on.src = "gif_nav_welcomeON.gif";
image1off = new Image(); image1off.src = "gif_nav_welcome.gif";
image2on = new Image(); image2on.src = "gif_nav_tourON.gif";
image2off = new Image(); image2off.src = "gif_nav_tour.gif";
image3on = new Image(); image3on.src = "gif_nav_calendarON.gif";
image3off = new Image(); image3off.src = "gif_nav_calendar.gif";
image4on = new Image(); image4on.src = "gif_nav_areainfoON.gif";
image4off = new Image(); image4off.src = "gif_nav_areainfo.gif";
image5on = new Image(); image5on.src = "gif_nav_directionsON.gif";
image5off = new Image(); image5off.src = "gif_nav_directions.gif";
image6on = new Image(); image6on.src = "gif_nav_contactON.gif";
image6off = new Image(); image6off.src = "gif_nav_contact.gif"}

function turnOn(imageName) 
{if (document) {document[imageName].src = eval(imageName + "on.src");}}
function turnOff(imageName) 
{if (document) {document[imageName].src = eval(imageName + "off.src");}}