var agt=navigator.userAgent.toLowerCase();
var is_major = parseInt(navigator.appVersion);
var is_minor = parseFloat(navigator.appVersion);

var is_nav  = ((agt.indexOf('mozilla')!=-1) && (agt.indexOf('spoofer')==-1)
                && (agt.indexOf('compatible') == -1) && (agt.indexOf('opera')==-1)
                && (agt.indexOf('webtv')==-1) && (agt.indexOf('hotjava')==-1));
var is_nav6up = (is_nav && (is_major >= 5));
var is_gecko = (agt.indexOf('gecko') != -1);
var is_ie     = ((agt.indexOf("msie") != -1) && (agt.indexOf("opera") == -1));
var is_aol   = (agt.indexOf("aol") != -1);
var is_webtv = (agt.indexOf("webtv") != -1); 
var is_TVNavigator = ((agt.indexOf("navio") != -1) || (agt.indexOf("navio_aoltv") != -1)); 
var is_hotjava = (agt.indexOf("hotjava") != -1);
var is_opera = (agt.indexOf("opera") != -1);

var is_mac    = (agt.indexOf("mac")!=-1);
var is_sun   = (agt.indexOf("sunos")!=-1);
var is_irix  = (agt.indexOf("irix") !=-1);
var is_aix   = (agt.indexOf("aix") !=-1);
var is_freebsd = (agt.indexOf("freebsd")!=-1);
var is_linux = (agt.indexOf("inux")!=-1);
var is_win   = (agt.indexOf("win")!=-1)


var pfad = "../index.html";
if ( (is_ie && is_win) || is_opera || is_webtv || is_aol)
{
	document.write('<link rel="STYLESHEET" type="text/css" href="' + pfad + 'stylesheet-ie.css">');
}
else if (is_nav6up && is_win)
{
	document.write('<link rel="STYLESHEET" type="text/css" href="' + pfad + 'stylesheet-ns6.css">');
}

else if (is_nav && is_win)
{
	document.write('<link rel="STYLESHEET" type="text/css" href="' + pfad + 'stylesheet-ns.css">');
}
else if (is_ie && is_mac) 
{
	document.write('<link rel="STYLESHEET" type="text/css" href="' + pfad + 'stylesheet-ie-mac.css">');
}

else if (is_nav && is_mac) 
{
	document.write('<link rel="STYLESHEET" type="text/css" href="' + pfad + 'stylesheet-ns-mac.css">');
}

else if (is_linux || is_irix || is_aix || is_freebsd)
{
	document.write('<link rel="STYLESHEET" type="text/css" href="' + pfad + 'stylesheet-ns-linux.css">');
}
else 
{
	document.write('<link rel="STYLESHEET" type="text/css" href="' + pfad + 'stylesheet-ie.css">');
}