if (document.images) {
    homebuttonoff     = new Image() ;
    homebuttonoff.src = "images/home_off.jpg" ;
    homebuttonover     = new Image() ;
    homebuttonover.src = "images/home_over.jpg" ;

    registerbuttonoff     = new Image() ;
    registerbuttonoff.src = "images/register_off.jpg" ;
    registerbuttonover     = new Image() ;
    registerbuttonover.src = "images/register_over.jpg" ;

    aboutusbuttonoff     = new Image() ;
    aboutusbuttonoff.src = "images/aboutus_off.jpg" ;
    aboutusbuttonover     = new Image() ;
    aboutusbuttonover.src = "images/aboutus_over.jpg" ;

    contactusbuttonoff     = new Image() ;
    contactusbuttonoff.src = "images/contactus_off.jpg" ;
    contactusbuttonover     = new Image() ;
    contactusbuttonover.src = "images/contactus_over.jpg" ;

    sponsorsbuttonoff     = new Image() ;
    sponsorsbuttonoff.src = "images/sponsors_off.jpg" ;
    sponsorsbuttonover     = new Image() ;
    sponsorsbuttonover.src = "images/sponsors_over.jpg" ;

    gallerybuttonoff     = new Image() ;
    gallerybuttonoff.src = "images/gallery_off.jpg" ;
    gallerybuttonover     = new Image() ;
    gallerybuttonover.src = "images/gallery_over.jpg" ;

    teamsbuttonoff     = new Image() ;
    teamsbuttonoff.src = "images/teams_off.jpg" ;
    teamsbuttonover     = new Image() ;
    teamsbuttonover.src = "images/teams_over.jpg" ;

    eventbuttonoff     = new Image() ;
    eventbuttonoff.src = "images/event_off.jpg" ;
    eventbuttonover     = new Image() ;
    eventbuttonover.src = "images/event_over.jpg" ;
}

function buttonover( buttonname ) {
    if (document.images) {
      document.all['MyGunClick'].src='sounds/gun_click.mp3' 
      document[ buttonname ].src = eval( buttonname + "over.src" );
    }
}

function buttonoff ( buttonname ) {
    if (document.images) {
      document[ buttonname ].src = eval( buttonname + "off.src" );
    }
}

function playGunClick() {
   document.all['MyGunClick'].src='sounds/gun_click.mp3' 
}