ie4 = ((navigator.appName == "Microsoft Internet Explorer") && (parseInt(navigator.appVersion) >= 4 ));

ns6 = ((navigator.userAgent.indexOf("Gecko") != -1));

function toggle( targetId ){
	if (ie4 || ns6) {
	
		if (ie4) target = document.all(targetId);
		if (ns6) target = document.getElementById(targetId);
		
		if (target.style.display == "none"){
			target.style.display = "";
		} else {
			target.style.display = "none";
		}
	} else {
		alert("browser not supported: " + navigator.appName +' '+ parseInt(navigator.appVersion));
	}
}