ghale I just tested it with the CocoonJS launcher on a Samsung Galaxy S3, and a Nexus 7. Everything looks fine here.
Here is a screen shot taken off of my Samsung Galaxy S3:
<img src="http://i51.tinypic.com/313n62c.png" border="0" />
What type of device are you testing on, and what OS is it running? CocoonJS doesn't work very well on 2.2 and older.
Maybe I'm not understanding exactly what your trying to accomplish?