var browser = navigator.userAgent.toLowerCase();
var ganzzahl = parseInt(navigator.appVersion);
var genauezahl = parseFloat(navigator.appVersion);
//ist es netscape
var netscap = ((browser.indexOf('mozilla')!=-1) && (browser.indexOf('spoofer')==-1) && (browser.indexOf('compatible') == -1) && (browser.indexOf('opera')==-1) && (browser.indexOf('webtv')==-1) && (browser.indexOf('hotjava')==-1));
var netscap4 = (netscap && (ganzzahl == 4));

if ( netscap4 )
document.write('<link rel=stylesheet href=./css/nsc4x.css>')
else
document.write('<link rel=stylesheet href=./css/layer2.css>')