
if (document.images){
    knap_01_n = new Image(); knap_01_n.src = "images/knap_01_n.gif";
    knap_01_s = new Image(); knap_01_s.src = "images/knap_01_s.gif";
    knap_02_n = new Image(); knap_02_n.src = "images/knap_02_n.gif";
    knap_02_s = new Image(); knap_02_s.src = "images/knap_02_s.gif";
    knap_03_n = new Image(); knap_03_n.src = "images/knap_03_n.gif";
    knap_03_s = new Image(); knap_03_s.src = "images/knap_03_s.gif";
    knap_04_n = new Image(); knap_04_n.src = "images/knap_04_n.gif";
    knap_04_s = new Image(); knap_04_s.src = "images/knap_04_s.gif";
    knap_05_n = new Image(); knap_05_n.src = "images/knap_05_n.gif";
    knap_05_s = new Image(); knap_05_s.src = "images/knap_05_s.gif";
}

function mo(imgName) {
    imgselect = eval (imgName + "_s.src")
    document[imgName].src = imgselect
}

function off(imgName) { 
    imgselect = eval (imgName + "_n.src")
    document[imgName].src = imgselect
} 