var browserName = navigator.appName;
var browserVer = parseInt(navigator.appVersion,10);
var version;

if (3 == 3) { version="NO"; }
if (browserName == "Netscape" && browserVer >= 3) { version = "OK"; }
if (browserName == "Microsoft Internet Explorer" && browserVer >= 4) { version = "OK"; }

if (version == "OK")
{

var welcome2 = new Image(110, 23);
welcome2.src = "../graphics/welcome2.gif";
var welcome0 = new Image(110, 23);
welcome0.src = "../graphics/welcome0.gif";

var contents2 = new Image(110, 23);
contents2.src = "../graphics/contents2.gif";
var contents0 = new Image(110, 23);
contents0.src = "../graphics/contents0.gif";

var submit2 = new Image(110, 23);
submit2.src = "../graphics/submit2.gif";
var submit0 = new Image(110, 23);
submit0.src = "../graphics/submit0.gif";

var about2 = new Image(110, 23);
about2.src = "../graphics/about2.gif";
var about0 = new Image(110, 23);
about0.src = "../graphics/about0.gif";

var contact2 = new Image(110, 23);
contact2.src = "../graphics/contact2.gif";
var contact0 = new Image(110, 23);
contact0.src = "../graphics/contact0.gif";

}

function img_act(imgName) {
if (version == "OK")
{
var imgOn = eval(imgName + "2.src");
document[imgName].src = imgOn;
}
}

function img_inact(imgName) {
if (version == "OK")
{
var imgOff = eval(imgName + "0.src");
document[imgName].src = imgOff;
}
}