browserName = navigator.appName;
    browserVer = parseInt(navigator.appVersion);

    if ((browserName == "Netscape" && browserVer >= 3)  ||
        (browserName == "Microsoft Internet Explorer" && browserVer >= 4)) version = "n3";
    else version = "n2";

    if (version == "n3") {
    i1on = new Image(); i1on.src = "../img/logo_khk.gif";
    i2on = new Image(); i2on.src = "../img/logo_ec.gif";
    i3on = new Image(); i3on.src = "../img/logo_k.gif";
    i4on = new Image(); i4on.src = "../img/logo_wik.gif";

    i1off = new Image(); i1off.src = "../img/logp_khk.gif";
    i2off = new Image(); i2off.src = "../img/logp_ec.gif";
    i3off = new Image(); i3off.src = "../img/logp_k.gif";
    i4off = new Image(); i4off.src = "../img/logp_wik.gif";
    }

function img_act(imgName) {
        if (version == "n3") {
        imgOn = eval(imgName + "on.src");
        document [imgName].src = imgOn;
        }
}
function img_inact(imgName) {
        if (version == "n3") {
        imgOff = eval(imgName + "off.src");
        document [imgName].src = imgOff;
        }
}