a#lab_btn {
    background-image: url(../img/en_lab_btn.png);
    background-position: left center;
    height: 150px;
}
a#lab_btn:hover, a#lab_btn_act {
    background-image: url(../img/en_lab_sel_btn.png);
    height: 152px;
}

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


a#omne_btn {
    background-image: url(../img/en_omne_btn.png);
    background-position: left center;
    height: 124px;
}
a#omne_btn:hover, a#omne_btn_act {
    background-image: url(../img/en_omne_sel_btn.png);
    height: 126px;
}


a#uvod_btn {
    background-image: url(../img/en_uvod_btn.png);
    background-position: left top;
    height: 71px;
}
a#uvod_btn:hover, a#uvod_btn_act {
    background-image: url(../img/en_uvod_sel_btn.png);
    height: 72px;
}