function aimg_up (imgName) {

     if (document.images) {

        imgUp = eval(imgName + "up.src");

        document [imgName].src = imgUp;

     }

    }

    function aimg_dn (imgName) {

     if (document.images) {

        imgDn = eval(imgName + "dn.src");

        document [imgName].src = imgDn;

     }

    }



function all_up (){

if (document.images) {

aimg_up('a1')

aimg_up('a2')

aimg_up('a3')

aimg_up('a4')

}

}



function all_dn (){

if (document.images) {

aimg_dn('a1')

aimg_dn('a2')

aimg_dn('a3')

aimg_dn('a4')
}

}



    a1up = new Image();

    a1dn = new Image();

    a1up.src ="bilder/button_historie_red.jpg";

    a1dn.src ="bilder/button_historie.jpg";



    a2up = new Image();

    a2dn = new Image();

    a2up.src ="bilder/button_fotos_red.jpg";

    a2dn.src ="bilder/button_fotos.jpg";



    a3up = new Image();

    a3dn = new Image();

    a3up.src ="bilder/button_personal_red.jpg";

    a3dn.src ="bilder/button_personal.jpg";



    a4up = new Image();

    a4dn = new Image();

    a4up.src ="bilder/button_links_red.jpg";

    a4dn.src ="bilder/button_links.jpg";