brible,all you need is a live supply to the common on switch one,then connect a wire from l1 on first switch to l1 on second switch,then connect wire from l2 on first switch to l2 on second switch now connect a wire from the common on second switch to the light,take the live from your ceiling rose,then connect the live from the second switch common to the light at ceiling rose,where the brown or blue flexible lead is.
gts
July 2011