In order to be Google "mobile friendly" I included the code

  <script type="text/javascript"> if (screen.width <=648) {document.location = "/m/"; } </script>

in the expert section advanced secting  - before closing the head. This works and traffic from smaller devices is sent to jpw.ca/m where a mobile version exists.

Question:

How do I create instuctions that can enable direction to individual sites in the jpw.ca/m directory rather than always to jpw.ca? 

Help.