if (document.images) {
    nav_selecthardwood       = new Image();
    nav_selecthardwood.src   = "images/nav_selecthardwood.gif" ;
    nav_selecthardwood_s       = new Image();
    nav_selecthardwood_s.src   = "images/nav_selecthardwood_s.gif" ;

    nav_acoustic       = new Image();
    nav_acoustic.src   = "images/nav_acoustic.gif" ;
    nav_acoustic_s       = new Image();
    nav_acoustic_s.src   = "images/nav_acoustic_s.gif" ;

    nav_whatsnew       = new Image();
    nav_whatsnew.src   = "images/nav_whatsnew.gif" ;
    nav_whatsnew_s       = new Image();
    nav_whatsnew_s.src   = "images/nav_whatsnew_s.gif" ;

    nav_showroom       = new Image();
    nav_showroom.src   = "images/nav_showroom.gif" ;
    nav_showroom_s       = new Image();
    nav_showroom_s.src   = "images/nav_showroom_s.gif" ;

    nav_calculator       = new Image();
    nav_calculator.src   = "images/nav_calculator.gif" ;
    nav_calculator_s       = new Image();
    nav_calculator_s.src   = "images/nav_calculator_s.gif" ;

    nav_faq       = new Image();
    nav_faq.src   = "images/nav_faq.gif" ;
    nav_faq_s       = new Image();
    nav_faq_s.src   = "images/nav_faq_s.gif" ;

    nav_moisture       = new Image();
    nav_moisture.src   = "images/nav_moisture.gif" ;
    nav_moisture_s       = new Image();
    nav_moisture_s.src   = "images/nav_moisture_s.gif" ;

    nav_floorcare       = new Image();
    nav_floorcare.src   = "images/nav_floorcare.gif" ;
    nav_floorcare_s       = new Image();
    nav_floorcare_s.src   = "images/nav_floorcare_s.gif" ;

    nav_darkfloors       = new Image();
    nav_darkfloors.src   = "images/nav_darkfloors.gif" ;
    nav_darkfloors_s       = new Image();
    nav_darkfloors_s.src   = "images/nav_darkfloors_s.gif" ;

    nav_distressed       = new Image();
    nav_distressed.src   = "images/nav_distressed.gif" ;
    nav_distressed_s       = new Image();
    nav_distressed_s.src   = "images/nav_distressed_s.gif" ;

    nav_refinishing       = new Image();
    nav_refinishing.src   = "images/nav_refinishing.gif" ;
    nav_refinishing_s       = new Image();
    nav_refinishing_s.src   = "images/nav_refinishing_s.gif" ;

    nav_installation       = new Image();
    nav_installation.src   = "images/nav_installation.gif" ;
    nav_installation_s       = new Image();
    nav_installation_s.src   = "images/nav_installation_s.gif" ;
}
function thedown( buttonname )
{
    if (document.images) {
      document[ buttonname ].src = eval( buttonname + "_s.src" );
    }
}
function theup ( buttonname )
{
    if (document.images) {
      document[ buttonname ].src = eval( buttonname + ".src" );
    }
}