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

    if (br== "n3") {

		Class_Menu_01on=new Image();
		Class_Menu_01on.src = "/image/class/class_m01_b.gif";
		Class_Menu_02on=new Image();
		Class_Menu_02on.src = "/image/class/class_m02_b.gif";
		Class_Menu_03on=new Image();
		Class_Menu_03on.src = "/image/class/class_m03_b.gif";
		Class_Menu_04on=new Image();
		Class_Menu_04on.src = "/image/class/class_m04_b.gif";
		Class_Menu_05on=new Image();
		Class_Menu_05on.src = "/image/class/class_m05_b.gif";
		Class_Menu_06on=new Image();
		Class_Menu_06on.src = "/image/class/class_m06_b.gif";
		Class_Menu_07on=new Image();
		Class_Menu_07on.src = "/image/class/class_m07_b.gif";
		Class_Menu_08on=new Image();
		Class_Menu_08on.src = "/image/class/class_m08_b.gif";
		Class_Menu_09on=new Image();
		Class_Menu_09on.src = "/image/class/class_m09_b.gif";

     

		Class_Menu_01off=new Image();
		Class_Menu_01off.src = "/image/class/class_m01_a.gif";
		Class_Menu_02off=new Image();
		Class_Menu_02off.src = "/image/class/class_m02_a.gif";
		Class_Menu_03off=new Image();
		Class_Menu_03off.src = "/image/class/class_m03_a.gif";
		Class_Menu_04off=new Image();
		Class_Menu_04off.src = "/image/class/class_m04_a.gif";
		Class_Menu_05off=new Image();
		Class_Menu_05off.src = "/image/class/class_m05_a.gif";
		Class_Menu_06off=new Image();
		Class_Menu_06off.src = "/image/class/class_m06_a.gif";
		Class_Menu_07off=new Image();
		Class_Menu_07off.src = "/image/class/class_m07_a.gif";
        Class_Menu_08off=new Image();
		Class_Menu_08off.src = "/image/class/class_m08_a.gif";
		Class_Menu_09off=new Image();
		Class_Menu_09off.src = "/image/class/class_m09_a.gif";

	}

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

	function imgInact(imgName) {
	   if (br == "n3") {
	   document[imgName].src = eval(imgName + "off.src");
	}
}