bName = navigator.appName;
bVer = parseInt(navigator.appVersion);
    if ((bName == "Netscape" && bVer >= 3) || 
        (bName == "Microsoft Internet Explorer" && bVer >= 4)) br = "n3"; 
    else br = "n2";

<!--オンマウスしたときの画像-->
if (br== "n3") {
img1on = new Image();          
img1on.src = "images/s_2.gif";
img2on = new Image();          
img2on.src = "images/i_2.gif";
img3on = new Image();          
img3on.src = "images/c_2.gif";
img4on = new Image();          
img4on.src = "images/d_2.gif";
img5on = new Image();          
img5on.src = "images/h_2.gif";
img6on = new Image();          
img6on.src = "images/k_2.gif";
img7on = new Image();          
img7on.src = "images/q_2.gif";
img8on = new Image();          
img8on.src = "images/m_2.gif";

<!--オフマウスしたときの画像-->
img1off = new Image();          
img1off.src = "images/s_1.gif";
img2off = new Image();          
img2off.src = "images/i_1.gif";
img3off = new Image();          
img3off.src = "images/c_1.gif";
img4off = new Image();          
img4off.src = "images/d_1.gif";
img5off = new Image();          
img5off.src = "images/h_1.gif";
img6off = new Image();          
img6off.src = "images/k_1.gif";
img7off = new Image();          
img7off.src = "images/q_1.gif";
img8off = new Image();          
img8off.src = "images/m_1.gif";

<!--出てくる言葉の画像-->
img1home = new Image();
img1home.src = "images/top_s.jpg";
img2home = new Image();
img2home.src = "images/top_i.jpg";
img3home = new Image();
img3home.src = "images/top_c.jpg";
img4home = new Image();
img4home.src = "images/top_d.jpg";
img5home = new Image();
img5home.src = "images/top_h.jpg";
img6home = new Image();
img6home.src = "images/top_k.jpg";
img7home = new Image();
img7home.src = "images/top_q.jpg";
img8home = new Image();
img8home.src = "images/top_m.jpg";
}

function imgAct(imgName) {
if (br== "n3") {
document[imgName].src = eval(imgName + "on.src");
document["imghomebox"].src = eval(imgName + "home.src");
}
}

<!--デフォルトで表示されてる画像の定義-->
function imgInact(imgName) {
if (br== "n3") {
document[imgName].src = eval(imgName + "off.src");
document["imghomebox"].src = "images/read.jpg";
}
}
function notAlotHappening(){return;}