var __ua__ = navigator.userAgent.toLowerCase();

if (__ua__.indexOf('firefox') > -1) {
	document.writeln('<link rel="stylesheet" type="text/css" href="/common/css/ff.css" media="all">');
}
if (__ua__.indexOf('opera') > -1) {
	document.writeln('<link rel="stylesheet" type="text/css" href="/common/css/opera.css" media="all">');
}