function whichBrs() {
	var agt=navigator.userAgent.toLowerCase();
	if (agt.indexOf("opera") != -1) return 'Opera';
	if (agt.indexOf("staroffice") != -1) return 'Star Office';
	if (agt.indexOf("webtv") != -1) return 'WebTV';
	if (agt.indexOf("beonex") != -1) return 'Beonex';
	if (agt.indexOf("chimera") != -1) return 'Chimera';
	if (agt.indexOf("netpositive") != -1) return 'NetPositive';
	if (agt.indexOf("phoenix") != -1) return 'Phoenix';
	if (agt.indexOf("firefox") != -1) return 'Firefox';
	if (agt.indexOf("safari") != -1) return 'Safari';
	if (agt.indexOf("skipstone") != -1) return 'SkipStone';
	if (agt.indexOf("msie") != -1) { // return 'Internet Explorer';
		//***************** GESTION DES IMAGES PNG
		for( var i = 0 ; i < document.images.length ; i++ ) {
			var img = document.images[i];
			var imgName = img.src.toUpperCase();
			if ( imgName.substring(imgName.length-3, imgName.length) == "PNG" || imgName.match(".PHP") ) {
				var imgID = (img.id) ? "id='" + img.id + "' " : "";
				var imgClass = (img.className) ? "class='" + img.className + "' " : "";
				var imgTitle = (img.title) ? "title='" + img.title + "' " : "title='" + img.alt + "' ";
				var imgStyle = "display:inline-block;" + img.style.cssText;
				if (img.align == "left") imgStyle = "float:left;" + imgStyle;
				if (img.align == "right") imgStyle = "float:right;" + imgStyle;
				if (img.parentElement.href) imgStyle = "cursor:hand;" + imgStyle;
				var strNewHTML = "<span " + imgID + imgClass + imgTitle
								+ " style=\"" + "width:" + img.width + "px; height:" + img.height + "px;" + imgStyle + ";"
								+ "filter:progid:DXImageTransform.Microsoft.AlphaImageLoader"
								+ "(src=\'" + img.src + "\', sizingMethod='scale');\"></span>";
				img.outerHTML = strNewHTML;
				i = i - 1;
			}
		}
		//***************** FIN GESTION DES IMAGES PNG
	}
	if (agt.indexOf("netscape") != -1) return 'Netscape';
	if (agt.indexOf("mozilla/5.0") != -1) return 'Mozilla';
	if (agt.indexOf('\/') != -1) {
		if (agt.substr(0,agt.indexOf('\/')) != 'mozilla') {
			return navigator.userAgent.substr(0,agt.indexOf('\/'));
		}
		else return 'Netscape';
	}
	else if (agt.indexOf(' ') != -1) {
			return navigator.userAgent.substr(0,agt.indexOf(' '));
	}
	else return navigator.userAgent;
}