var ns=document.all?false:true;
var mac=navigator.platform.search(/mac/gi)>-1?true:false;
var win=navigator.platform.search(/win/gi)>-1?true:false;

document.write('<link rel="stylesheet" type="text/css" href="include/');
if(mac){
  document.write(ns?'ns':'ie');
}
else if(win){
  document.write(ns?'ns':'ie');
}
else{
  document.write(ns?'ns':'ie');
}
document.write('.css">');