var N=navigator.appName; var V=navigator.appVersion;

var version="?"; var nom=N; var os="?"; var langue="?";
if (N=="Microsoft Internet Explorer") {
	langue=navigator.systemLanguage
	version=V.substring(V.indexOf("MSIE",0)+5,V.indexOf(";",V.indexOf("MSIE",0)));
	if (V.indexOf("Win",0)>0) {

		if ( V.indexOf(";",V.indexOf("Win",0)) > 0 ) {
			os=V.substring(V.indexOf("Win",0),V.indexOf(";",V.indexOf("Win",0)));
		} else {
			os=V.substring(V.indexOf("Win",0),V.indexOf(")",V.indexOf("Win",0)));
		}
	}
	if (V.indexOf("Mac",0)>0) {
		os="Macintosh";
		version=V.substring(V.indexOf("MSIE",0)+5,V.indexOf("?",V.indexOf("MSIE",0)));
	}
}
if (N=="Netscape") {
	langue=navigator.systemLanguage
	version=(V.substring(0,V.indexOf("(",0)));
	if (V.indexOf("Mac",0)>0) {
		os="Macintosh";
	}
	if (V.indexOf("Linux",0)>0) {
		os="Linux";
	}
	if (V.indexOf("Win",0)>0) {
		os=V.substring(V.indexOf("Win",0),V.indexOf(";",V.indexOf("Win",0)));
	}
	if (version==5) {
		version="6.0"
	}
}

if (N == "Microsoft Internet Explorer"){
	if (version < "5.5"){
		alert("This site requires Microsoft Internet Explorer, versie 5.5 or higher.")
	}
}else{
	alert("This site requires Microsoft Internet Explorer, versie 5.5 or higher.")
}