browserName = navigator.appName;
browserVer = parseInt(navigator.appVersion);
if (browserName == "Netscape" && browserVer >= 3) version = "n3";
else if (browserName == "Microsoft Internet Explorer" && browserVer >= 3) version = "n3";
else version = "n2";
if (version == "n3")
{

n_1on = new Image();
n_1on.src = "http://www.nct.co.jp/web/img/menu_1_on.gif";
n_1off = new Image();
n_1off.src = "http://www.nct.co.jp/web/img/menu_1.gif";

n_2on = new Image();
n_2on.src = "http://www.nct.co.jp/web/img/menu_2_on.gif";
n_2off = new Image();
n_2off.src = "http://www.nct.co.jp/web/img/menu_2.gif";

n_3on = new Image();
n_3on.src = "http://www.nct.co.jp/web/img/menu_3_on.gif";
n_3off = new Image();
n_3off.src = "http://www.nct.co.jp/web/img/menu_3.gif";

n_4on = new Image();
n_4on.src = "http://www.nct.co.jp/web/img/menu_4_on.gif";
n_4off = new Image();
n_4off.src = "http://www.nct.co.jp/web/img/menu_4.gif";

//サブメニュー
//top

n_10on = new Image();
n_10on.src = "http://www.nct.co.jp/web/img/sub_menu_0_on.gif";
n_10off = new Image();
n_10off.src = "http://www.nct.co.jp/web/img/sub_menu_0_off.gif";

n_11on = new Image();
n_11on.src = "http://www.nct.co.jp/web/img/sub_menu_0.gif";
n_11off = new Image();
n_11off.src = "http://www.nct.co.jp/web/img/sub_menu_0.gif";

n_12on = new Image();
n_12on.src = "http://www.nct.co.jp/web/img/sub_menu_1_on.gif";
n_12off = new Image();
n_12off.src = "http://www.nct.co.jp/web/img/sub_menu_1_off.gif";

n_13on = new Image();
n_13on.src = "http://www.nct.co.jp/web/img/sub_menu_1.gif";
n_13off = new Image();
n_13off.src = "http://www.nct.co.jp/web/img/sub_menu_0.gif";

n_14on = new Image();
n_14on.src = "http://www.nct.co.jp/web/img/sub_menu_2_on.gif";
n_14off = new Image();
n_14off.src = "http://www.nct.co.jp/web/img/sub_menu_2_off.gif";

n_15on = new Image();
n_15on.src = "http://www.nct.co.jp/web/img/sub_menu_2.gif";
n_15off = new Image();
n_15off.src = "http://www.nct.co.jp/web/img/sub_menu_0.gif";

//業務内容

n_21on = new Image();
n_21on.src = "http://www.nct.co.jp/web/img/sub_menu_0.gif";
n_21off = new Image();
n_21off.src = "http://www.nct.co.jp/web/img/sub_menu_1.gif";

n_23on = new Image();
n_23on.src = "http://www.nct.co.jp/web/img/sub_menu_1.gif";
n_23off = new Image();
n_23off.src = "http://www.nct.co.jp/web/img/sub_menu_1.gif";

n_25on = new Image();
n_25on.src = "http://www.nct.co.jp/web/img/sub_menu_2.gif";
n_25off = new Image();
n_25off.src = "http://www.nct.co.jp/web/img/sub_menu_1.gif";

//プラン紹介

n_31on = new Image();
n_31on.src = "http://www.nct.co.jp/web/img/sub_menu_0.gif";
n_31off = new Image();
n_31off.src = "http://www.nct.co.jp/web/img/sub_menu_2.gif";

n_33on = new Image();
n_33on.src = "http://www.nct.co.jp/web/img/sub_menu_1.gif";
n_33off = new Image();
n_33off.src = "http://www.nct.co.jp/web/img/sub_menu_2.gif";

n_35on = new Image();
n_35on.src = "http://www.nct.co.jp/web/img/sub_menu_2.gif";
n_35off = new Image();
n_35off.src = "http://www.nct.co.jp/web/img/sub_menu_2.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;
        }
}