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

if (browserNam == "Microsoft Internet Explorer" && browserVer >= 4) checker = "OK";
else {
if (browserNam == "Netscape" && browserVer >= 3) checker = "OK";
else checker = "NO";
}

if (checker == "OK") {
menu01ImgOn = new Image(); menu01ImgOn.src = "../images/menu01_on.gif";
menu01ImgOff = new Image(); menu01ImgOff.src = "../images/menu01_off.gif";

menu02ImgOn = new Image(); menu02ImgOn.src = "../images/menu02_on.gif";
menu02ImgOff = new Image(); menu02ImgOff.src = "../images/menu02_off.gif";

menu03ImgOn = new Image(); menu03ImgOn.src = "../images/menu03_on.gif";
menu03ImgOff = new Image(); menu03ImgOff.src = "../images/menu03_off.gif";

menu04ImgOn = new Image(); menu04ImgOn.src = "../images/menu04_on.gif";
menu04ImgOff = new Image(); menu04ImgOff.src = "../images/menu04_off.gif";

menu05ImgOn = new Image(); menu05ImgOn.src = "../images/menu05_on.gif";
menu05ImgOff = new Image(); menu05ImgOff.src = "../images/menu05_off.gif";

menu06ImgOn = new Image(); menu06ImgOn.src = "../images/menu06_on.gif";
menu06ImgOff = new Image(); menu06ImgOff.src = "../images/menu06_off.gif";

menu07ImgOn = new Image(); menu07ImgOn.src = "../images/menu07_on.gif";
menu07ImgOff = new Image(); menu07ImgOff.src = "../images/menu07_off.gif";

}

function imgAct(imgName) {
if (checker == "OK") {
document [imgName].src = eval(imgName + "ImgOn.src");
}
}

function imgInact(imgName) {
if (checker == "OK") {
document [imgName].src = eval(imgName + "ImgOff.src");
}
}