if (document.images) {
    explorebuttonup       = new Image();
    explorebuttonup.src   = "images/menu_explore_niagara.jpg" ;
    explorebuttondown     = new Image() ;
    explorebuttondown.src = "images/menu_explore_niagara_over.jpg" ;

    thingstodobuttonup       = new Image();
    thingstodobuttonup.src   = "images/menu_things_to_do.jpg" ;
    thingstodobuttondown     = new Image() ;
    thingstodobuttondown.src = "images/menu_things_to_do_over.jpg" ;

    staybuttonup       = new Image();
    staybuttonup.src   = "images/menu_stay.jpg" ;
    staybuttondown     = new Image() ;
    staybuttondown.src = "images/menu_stay_over.jpg" ;

    dinebuttonup       = new Image();
    dinebuttonup.src   = "images/menu_dine.jpg" ;
    dinebuttondown     = new Image() ;
    dinebuttondown.src = "images/menu_dine_over.jpg" ;

    eventsbuttonup       = new Image();
    eventsbuttonup.src   = "images/menu_events.jpg" ;
    eventsbuttondown     = new Image() ;
    eventsbuttondown.src = "images/menu_events_over.jpg" ;

    videosbuttonup       = new Image();
    videosbuttonup.src   = "images/menu_videos.jpg" ;
    videosbuttondown     = new Image() ;
    videosbuttondown.src = "images/menu_videos_over.jpg" ;

    planbuttonup       = new Image();
    planbuttonup.src   = "images/menu_plan.jpg" ;
    planbuttondown     = new Image() ;
    planbuttondown.src = "images/menu_plan_over.jpg" ;

}
function buttondown( buttonname )
{
    if (document.images) {
      document[ buttonname ].src = eval( buttonname + "down.src" );
    }
}
function buttonup ( buttonname )
{
    if (document.images) {
      document[ buttonname ].src = eval( buttonname + "up.src" );
    }
}