var net4=(document.layers)?true:false;
var net6=((navigator.appName.indexOf("Net")!=-1)&&!net4);
var ie5=(document.getElementById&&!net6)?true:false;
var ie4=(document.all&&!document.getElementById)?true:false;
var isMac=(navigator.appVersion.indexOf("Mac")!=-1);
var dom=(document.getElementById)?true:false;


//inserisco css in comune
document.writeln("<link rel='stylesheet' type='text/css' href='../css/base.css'>");
//inserisco css dedicati
if(net4){document.writeln("<link rel='stylesheet' type='text/css' href='../css/style_n4.css'>");}
if(net6){document.writeln("<link rel='stylesheet' type='text/css' href='../css/style_n6.css'>");}
if(ie5||ie4){document.writeln("<link rel='stylesheet' type='text/css' href='../css/style.css'>");}