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")
	 {
	 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;
}