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