NJT: fix tile width for mobile

Old:
![screenshot - 08222014 - 04 07 16 pm](https://cloud.githubusercontent.com/assets/4411471/4016841/70c90734-2a39-11e4-8c6a-0ced68194fc5.png)

New:
![photo](https://cloud.githubusercontent.com/assets/4411471/4016842/764c8816-2a39-11e4-8fc0-8707653ba5a8.PNG)