var sys = "";
var nav = "";
var usag = navigator.userAgent;

if ((usag.indexOf('IX') != -1)||(usag.indexOf('Linux') != -1)||(usag.indexOf('SunOS') != -1)) { sys = 'UNIX ou Linux'; }
else if ( usag.indexOf('Win') != -1) 
{
	 if ( usag.indexOf('95') != -1 ) { sys = 'Win 95'; }
	else if ( usag.indexOf('98') != -1 ) { sys = 'Win 98'; }
	else if ((usag.indexOf('NT 4.') != -1 )||( usag.indexOf('NT4.') != -1)) { sys = 'Win NT 4.x'; }
	else if ((usag.indexOf('NT 5.0') != -1 )||(usag.indexOf('NT5.0') != -1)) { sys = 'Win 2k'; }
	else if ((usag.indexOf('NT 5.1') != -1 )||(usag.indexOf('NT5.1') != -1)) { sys = 'Win XP'; }
	else  { sys = 'Win <=3 ou NT'; }
}
else if ( usag.indexOf('Mac') != -1 ) { sys = 'Mac'; }
else { sys = 'Inconnu'; }

if ( usag.indexOf('Opera') != -1 ) { nav = 'Opera'; }
else if ((usag.indexOf('MSIE 3') != -1 )||( usag.indexOf('MSIE3') != -1 )) { nav = 'IE 3.x'; }
else if ((usag.indexOf('MSIE 4') != -1 )||( usag.indexOf('MSIE4') != -1 )) { nav = 'IE 4.x'; }
else if ((usag.indexOf('MSIE 5.5') != -1 )||( usag.indexOf('MSIE5.5') != -1 )) { nav = 'IE 5.5'; }
else if ((usag.indexOf('MSIE 5') != -1 )||( usag.indexOf('MSIE5') != -1 )) { nav = 'IE 5.x'; }
else if ((usag.indexOf('MSIE 6') != -1 )||( usag.indexOf('MSIE6') != -1 )) { nav = 'IE 6.x'; }
else if ( usag.indexOf('Mozilla/3.') != -1 ) { nav = 'Netscape Navigator 3.x'; }
else if ( usag.indexOf('Mozilla/4.5') != -1 ) { nav = 'NS 4.5x'; }
else if ( usag.indexOf('Mozilla/4.7') != -1 ) { nav = 'NS 4.7x'; }
else if ( usag.indexOf('Mozilla/4') != -1 ) { nav = 'NS 4.x'; }
else if ( usag.indexOf('Mozilla/5.0') != -1 ) 
{
	if ( usag.indexOf('Netscape6') != -1 ) { nav = 'NS 6.x'; }
	else if ( usag.indexOf('Netscape/7.0') != -1 ) { nav = 'NS 7.x'; }
	else { nav = 'NS 6.x, 7.x ou Mozilla'; }
}
else { nav = 'Inconnu'; }