bName = navigator.appName;
bVer = parseInt(navigator.appVersion);

if  ((bName == "Netscape" && bVer >= 3) || (bName == "Microsoft Internet Explorer" && bVer >= 4)) ver = "good";
else ver = "bad";

imgs = new Array;
for(i=1; i<=7; i++) {
	imgs[i] = new Image();
	imgs[i].src = "/img/index"+i+"on.gif";
}

function img_act(imgName) {
	if (ver == "good")
		document[imgName].src = "/img/"+imgName+"on.gif";
}

function img_inact(imgName) {
	if (ver == "good")
		document[imgName].src = "/img/"+imgName+".gif";
}