var IE6 = false, IE7 = false,
FIREFOX2 = false, FIREFOX = false,
NETSCAPE7 = false, NETSCAPE = false,
OPERA9 = false, OPERA = false,
AUTRE = false;
var strChUserAgent = navigator.userAgent;
var intSplitStart = strChUserAgent.indexOf("(",0);
var intSplitEnd = strChUserAgent.indexOf(")",0);
var strChStart = strChUserAgent.substring(0,intSplitStart);
var strChMid = strChUserAgent.substring(intSplitStart, intSplitEnd);
var strChEnd = strChUserAgent.substring(strChEnd);

if(strChMid.indexOf("MSIE 7") != -1)
IE7 = true;
else if(strChMid.indexOf("MSIE 6") != -1)
IE6 = true;
else if(strChEnd.indexOf("Firefox/2") != -1)
FIREFOX2 = true;
else if(strChEnd.indexOf("Firefox") != -1)
FIREFOX = true;
else if(strChEnd.indexOf("Netscape/7") != -1)
NETSCAPE7 = true;
else if(strChEnd.indexOf("Netscape") != -1)
NETSCAPE = true;
else if(strChStart.indexOf("Opera/9") != -1)
OPERA9 = true;
else if(strChStart.indexOf("Opera") != -1)
OPERA = true;
else
AUTRE = true;