if (document.images) {
    img1_open           = new Image();
    img1_closed         = new Image();
    img2_open           = new Image();
    img2_closed         = new Image();

    img3_open           = new Image();
    img3_closed         = new Image();

    img4_open           = new Image();
    img4_closed         = new Image();

    img5_open           = new Image();
    img5_closed         = new Image();

    img6_open           = new Image();
    img6_closed         = new Image();

    img7_open           = new Image();
    img7_closed         = new Image();

    img8_open           = new Image();
    img8_closed         = new Image();
   
    img1_closed.src      = "img/onas.png";
    img1_open.src    = "img/onas_off.png";
    
    img2_closed.src      = "img/kursy.png";
    img2_open.src    = "img/kursy_off.png";

    img3_closed.src      = "img/dwujezycznosc.png";
    img3_open.src    = "img/dwujezycznosc_off.png";
    
    img4_closed.src      = "img/oferta.png";
    img4_open.src    = "img/oferta_off.png";

    img5_closed.src      = "img/aktualnosci.png";
    img5_open.src    = "img/aktualnosci_off.png";
    
    img6_closed.src      = "img/rekomendacje.png";
    img6_open.src    = "img/rekomendacje_off.png";

    img7_closed.src      = "img/galeria.png";
    img7_open.src    = "img/galeria_off.png";
    
    img8_closed.src      = "img/dokumenty.png";
    img8_open.src    = "img/dokumenty_off.png";
}


function over(i)
{
    if (document.images)
        eval('document.img'+i+'.src=img'+i+'_open.src');
}

function out(k)
{
    if (document.images)
        eval('document.img'+k+'.src=img'+k+'_closed.src');
}