if (document.images) {
welcome = new Image(150,40); welcome.src = "images/nav/welcome.gif";
home_on = new Image(150,40); welcome_on.src = "images/nav/welcome_on.gif";
about = new Image(150,40); about.src = "images/nav/about.gif";
about_on = new Image(150,40); about_on.src = "images/nav/about_on.gif";
trips = new Image(150,40); trips.src = "images/nav/trips.gif";
trips_on = new Image(150,40); trips_on.src = "images/nav/trips_on.gif";
guide = new Image(150,40); guide.src = "images/nav/guide.gif";
guide_on = new Image(150,40); guide_on.src = "images/nav/guide_on.gif";
info = new Image(150,40); info.src = "images/nav/info.gif";
info_on = new Image(150,40); info_on.src = "images/nav/info_on.gif";
contact = new Image(150,40); contact.src = "images/nav/contact.gif";
contact_on = new Image(150,40); contact_on.src = "images/nav/contact_on.gif";
}
/* Function that swaps images. */
function di20(id, newSrc) {
    var theImage = FWFindImage(document, id, 0);
    if (theImage) {
        theImage.src = newSrc;
    }
}

/* Functions that track and set toggle group button states. */

function FWFindImage(doc, name, j) {
    var theImage = false;
    if (doc.images) {
        theImage = doc.images[name];
    }
    if (theImage) {
        return theImage;
    }
    if (doc.layers) {
        for (j = 0; j < doc.layers.length; j++) {
            theImage = FWFindImage(doc.layers[j].document, name, 0);
            if (theImage) {
                return (theImage);
            }
        }
    }
    return (false);
}