opctions:
r -> redirectURL. './'で始まればRelative。'/'で始まればAbsolute。
d -> detect type. Read below.

// Desktop site
// http://foobar.com/dir/name/
<script src="/detecting.js?d=pc" type="text/javascript"></script>

// Desktop & tablet site
// http://foobar.com/dir/name/
<script src="/detecting.js?d=pc-tb" type="text/javascript"></script>

// mobile
// http://foobar.com/sp/dir/name/
<script src="/detecting.js?d=sp" type="text/javascript"></script>

// mobile & tabket site
// http://foobar.com/sp/dir/name/
<script src="/detecting.js?d=sp-tb" type="text/javascript"></script>