var myname = '.htm';
var myurl = location.href;
var mojin = myurl.indexOf(myname);
var mydir = myurl.substr(0,mojin);
var common = mydir + '/css/';

if(navigator.userAgent.toUpperCase().indexOf('WIN') != -1){
	with ( document ) {
		write ( '<LINK REL="stylesheet" ' );
		write ( 'TYPE="text/css" ' );
		write ( 'HREF="' + common + 'user_win.css">' );
	}
} else {
	with ( document ) {
		write ( '<LINK REL="stylesheet" ' );
		write ( 'TYPE="text/css" ' );
		write ( 'HREF="' + common + 'user_etc.css">' );
	}
}

with ( document ) {
	write ( '<LINK REL="stylesheet" ' );
	write ( 'TYPE="text/css" ' );
	write ( 'HREF="' + common + 'print.css\""+ media="print"');
}