a#lab_btn {
    background-image: url(../img/cs_lab_btn.png);
    background-position: left center;
    height: 138px;
}
a#lab_btn:hover, a#lab_btn_act {
    background-image: url(../img/cs_lab_sel_btn.png);
    height: 140px;
}

a#ruzne_btn {
    background-image: url(../img/cs_ruzne_btn.png);
    background-position: left bottom;
    height: 85px;
}
a#ruzne_btn:hover, a#ruzne_btn_act {
    background-image: url(../img/cs_ruzne_sel_btn.png);
    height: 86px;
}


a#omne_btn {
    background-image: url(../img/cs_omne_btn.png);
    background-position: left center;
    height: 84px;
}
a#omne_btn:hover, a#omne_btn_act {
    background-image: url(../img/cs_omne_sel_btn.png);
    height: 86px;
}

a#vyuka_btn {
    background-image: url(../img/cs_vyuka_btn.png);
    background-position: left center;
    height: 84px;
}
a#vyuka_btn:hover, a#vyuka_btn_act {
    background-image: url(../img/cs_vyuka_sel_btn.png);
    height: 86px;
}

a#studium_btn {
    background-image: url(../img/cs_studium_btn.png);
    background-position: left center;
    height: 112px;
}
a#studium_btn:hover, a#studium_btn_act {
    background-image: url(../img/cs_studium_sel_btn.png);
    height: 114px;
}

a#uvod_btn {
    background-image: url(../img/cs_uvod_btn.png);
    background-position: left top;
    height: 73px;
}
a#uvod_btn:hover, a#uvod_btn_act {
    background-image: url(../img/cs_uvod_sel_btn.png);
    height: 74px;
}