// convert all characters to lowercase to simplify testing 
var agt=navigator.userAgent.toLowerCase(); 

// *** BROWSER VERSION *** 
var vers = parseInt(navigator.appVersion); 

// *** BROWSER TYPE ***
var opera = (agt.indexOf("opera") != -1);
var opera7 = (opera && (vers >= 7));
var moz = (agt.indexOf("gecko") != -1);
var ie = ((agt.indexOf("msie") != -1) && !moz && !opera);
var ie4 = (ie && (vers >= 4));
var nn = ((agt.indexOf("mozilla") != -1) && !ie && !moz && !opera);
var nav4 = (nn && (vers >= 4));  

// *** PLATFORM ***
var is_win  = (agt.indexOf("win")!=-1);
var is_mac  = (agt.indexOf("mac")!=-1);
var is_unix = (agt.indexOf("x11")!=-1);

// Select the appropriate stylesheet
if (nav4 || ie4 || moz || opera7 || (!nn && !ie && !moz && !opera)) {
	var isFour = true;
	// var styles = location.protocol + "//www.sgi.com/styles/";
	var styles = location.protocol + "//www.isgroupe.com/_css/";
	if 	(is_win) styles += (nn)?"win_ns.css":"win_ie.css";	// Microsoft Windows 
	else if (is_mac) styles += (nn)?"mac_ns.css":"mac_ie.css";	// Apple Macintosh
	else 		 styles += (nn)?"unix.css":"win_ie.css";	// UNIX
	// document.write('<LINK REL="stylesheet" HREF="' + styles + '" TYPE="text/css">');
}