if (document.images) {
    hpup       = new Image();
    hpup.src   = "_images/btn_home.jpg" ;
    hpdown     = new Image() ;
    hpdown.src = "_images/btn_homeOVR.jpg" ;
    rulesup       = new Image();
    rulesup.src   = "_images/btn_rules.jpg" ;
    rulesdown     = new Image() ;
    rulesdown.src = "_images/btn_rulesOVR.jpg" ;
    catsup       = new Image();
    catsup.src   = "_images/btn_categories.jpg" ;
    catsdown     = new Image() ;
    catsdown.src = "_images/btn_categoriesOVR.jpg" ;
    judgeup       = new Image();
    judgeup.src   = "_images/btn_judging.jpg" ;
    judgedown     = new Image() ;
    judgedown.src = "_images/btn_judgingOVR.jpg" ;
    galaup       = new Image();
    galaup.src   = "_images/btn_gala.jpg" ;
    galadown     = new Image() ;
    galadown.src = "_images/btn_galaOVR.jpg" ;	
    contactup       = new Image();
    contactup.src   = "_images/btn_contact.jpg" ;
    contactdown     = new Image() ;
    contactdown.src = "_images/btn_contactOVR.jpg" ;
    entrup       = new Image();
    entrup.src   = "_images/btn_enter.jpg" ;
    entrdown     = new Image() ;
    entrdown.src = "_images/btn_enterOVR.jpg" ;
    hpinup       = new Image();
    hpinup.src   = "_images/btn_homeIN.jpg" ;
    hpindown     = new Image() ;
    hpindown.src = "_images/btn_homeINOVR.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" );
    }
}