browserName = navigator.appName;
browserVer = parseInt(navigator.appVersion);
if ( browserVer >= 3) goferit = "Yep";
else goferit = "Nope";

if (goferit == "Yep"){
	menu1on = new Image;  menu1on.src =  "img/presen1.jpg";

	menu1off = new Image;  menu1off.src =  "img/presen2.jpg";
}

function img_act(imgName) {
		if (goferit == "Yep") {
		imgOn = eval(imgName + "on.src");
		document [imgName].src = imgOn;
		}
}

function img_inact(imgName) {
		if (goferit == "Yep") {
		imgOff = eval(imgName + "off.src");
		document [imgName].src = imgOff;
		}
}