protected void navLinkTree() {
        navCellStart();
        if (classdoc.containingPackage().isIncluded()) {
            printHyperLink("../package-tree.html", "",
                configuration.getText("doclet.Tree"), true, "NavBarFont1");
        } else {
            printHyperLink(relativePath + "overview-tree.html", "",
                configuration.getText("doclet.Tree"), true, "NavBarFont1");
        }
        navCellEnd();
    }