if ( navigator.userAgent.indexOf('Opera') != -1 )
    document.write('<LINK rel="stylesheet" type="text/css" href="mf.css">');
else
{
    if ( navigator.userAgent.indexOf('MSIE') != -1 )
        document.write('<LINK rel="stylesheet" type="text/css" href="mf_ie.css">');
    else
    {
        if ( navigator.userAgent.indexOf('Konqueror') != -1 )
            document.write('<LINK rel="stylesheet" type="text/css" href="mf.css">');
        else
            document.write('<LINK rel="stylesheet" type="text/css" href="mf.css">');
    }
}
