if (document.images) {

    homeup       = new Image();
    homeup.src   = "images/menu/home_up.gif" ;
    homedown     = new Image() ;
    homedown.src = "images/menu/home_over.gif" ;

    careerup       = new Image();
    careerup.src   = "images/menu/career_up.gif" ;
    careerdown     = new Image() ;
    careerdown.src = "images/menu/career_over.gif" ;

    gamesup       = new Image();
    gamesup.src   = "images/menu/games_up.gif" ;
    gamesdown     = new Image() ;
    gamesdown.src = "images/menu/games_over.gif" ;

    newsup       = new Image();
    newsup.src   = "images/menu/news_up.gif" ;
    newsdown     = new Image() ;
    newsdown.src = "images/menu/news_over.gif" ;

    contactup       = new Image();
    contactup.src   = "images/menu/contact_up.gif" ;
    contactdown     = new Image() ;
    contactdown.src = "images/menu/contact_over.gif" ;

}

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" );
    }
}