// Programme principal
function navigateurDetection()
{
	// Lecture du nom du navigateur
	var ua = navigator.userAgent.toLowerCase(); 
	// Detection des navigateurs "simples"
	this.isSafari = (ua.indexOf('safari') != -1);
	this.isOpera = (ua.indexOf('opera') != -1);
	this.isIcab = (ua.indexOf('icab') != -1);
	this.isAol = (ua.indexOf('aol') != -1);
	this.isWebtv = (ua.indexOf('webtv') != -1);
	this.isHotjava = (ua.indexOf('hotjava') != -1);
	// Detection des navigateurs "complexes"
	this.isKonqueror = ((ua.indexOf('konqueror') != -1) && !this.isSafari);
	this.isGecko = ((ua.indexOf('gecko') != -1) && !this.isSafari);
	this.isIE = ((ua.indexOf('msie') != -1) && !this.isOpera && !this.isWebtv);
	this.isMozilla = (this.isGecko && (ua.indexOf('gecko/') + 14 == ua.length));
	if (this.isGecko) {
		this.isNS = (ua.indexOf('netscape') != -1);
	} else {
		this.isNS = (this.isMozilla && !this.isOpera && !this.isWebtv && !this.isHotjava && (ua.indexOf('spoofer') == -1) && (ua.indexOf('compatible') == -1));
	}
	// Detection de la version mineure du navigateur
	this.versionMinor = parseFloat(navigator.appVersion); 
	if (this.isNS && this.isGecko) {
		this.versionMinor = parseFloat(ua.substring(ua.lastIndexOf('/') + 1));
	} else if (this.isIE && (this.versionMinor >= 4)) {
		this.versionMinor = parseFloat(ua.substring(ua.indexOf('msie ') + 5));
	} else if (this.isMozilla) {
		this.versionMinor = parseFloat(ua.substring(ua.indexOf('rv:') + 3));
	} else if (this.isSafari) {
		this.versionMinor = parseFloat(ua.substring(ua.lastIndexOf('/') + 1));
	} else if (this.isOpera) {
		if (ua.indexOf('opera/') != -1) {
			this.versionMinor = parseFloat(ua.substring(ua.indexOf('opera/') + 6));
		} else {
			this.versionMinor = parseFloat(ua.substring(ua.indexOf('opera ') + 6));
		}
   	} else if (this.isKonqueror) {
		this.versionMinor = parseFloat(ua.substring(ua.indexOf('konqueror/') + 10));
	} else if (this.isIcab) {
		if (ua.indexOf('icab/') != -1) {
			this.versionMinor = parseFloat(ua.substring(ua.indexOf('icab/') + 6));
		} else {
			this.versionMinor = parseFloat(ua.substring(ua.indexOf('icab ') + 6));
		}
	}
	// Detection de la version majeure du navigateur
	this.versionMajor = parseInt(this.versionMinor);
	// Detection du support DOM
	this.isDOM1 = (document.getElementById);
	this.isDOM2Event = (document.addEventListener && document.removeEventListener);
	// Detection du support CSS
	if (document.compatMode) {
		this.mode = document.compatMode;
	} else {
		this.mode = 'BackCompat';
	}
	// Detection du systeme d'exploitation
	this.isWin = (ua.indexOf('win') != -1);
	this.isWin32 = (this.isWin && (ua.indexOf('95') != -1 || ua.indexOf('98') != -1 || ua.indexOf('nt') != -1 || ua.indexOf('win32') != -1 || ua.indexOf('32bit') != -1 || ua.indexOf('xp') != -1));
	this.isMac = (ua.indexOf('mac') != -1);
	this.isUnix = (ua.indexOf('unix') != -1 || ua.indexOf('sunos') != -1 || ua.indexOf('bsd') != -1 || ua.indexOf('x11') != -1);
	this.isLinux = (ua.indexOf('linux') != -1);
	// Partie specifique a Netscape
	this.isNS4x = (this.isNS && (this.versionMajor == 4));
	this.isNS40x = (this.isNS4x && (this.versionMinor < 4.5));
	this.isNS47x = (this.isNS4x && (this.versionMinor >= 4.7));
	this.isNS4up = (this.isNS && (this.versionMinor >= 4));
	this.isNS6x = (this.isNS && (this.versionMajor == 6));
	this.isNS6up = (this.isNS && (this.versionMajor >= 6));
	this.isNS7x = (this.isNS && (this.versionMajor == 7));
	this.isNS7up = (this.isNS && (this.versionMajor >= 7));
	// Partie specifique a Internet Explorer
	this.isIE4x = (this.isIE && (this.versionMajor == 4));
	this.isIE4up = (this.isIE && (this.versionMajor >= 4));
	this.isIE5x = (this.isIE && (this.versionMajor == 5));
	this.isIE55 = (this.isIE && (this.versionMinor == 5.5));
	this.isIE5up = (this.isIE && (this.versionMajor >= 5));
	this.isIE6x = (this.isIE && (this.versionMajor == 6));
	this.isIE6up = (this.isIE && (this.versionMajor >= 6));
	this.isIE4xMac = (this.isIE4x && this.isMac);
	// Partie specifique au moteur Gecko
	if (this.isGecko) {
		this.geckoVersion = ua.substring((ua.lastIndexOf('gecko/') + 6), (ua.lastIndexOf('gecko/') + 14));
	} else {
		this.geckoVersion = -1;
	}
}