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

var ns3up = (browserName == "Netscape" && browserVer >= 3);
var ie4up = (browserName.indexOf("Microsoft") >= 0 && browserVer >= 4);

function doPic(imgName,imgCap) {
	if (ns3up || ie4up) {
		imgOn = ("" + imgName);
		document.mainpic.src = imgOn;
		document.mainpic.alt = imgCap;
		document.mainpic.title = imgCap;
   }
}

function goUrl(u){
	a=document.createElement('form');
	a.method = 'get';
	a.action = u
	document.body.appendChild(a);
	a.submit();
}