Flv fast bakwrd/forwrd

i have smthing like a media player. I m using “ns.seek(ns.time+1)” for fast forwarding my net stream,it works…
but similar “ns.seek(ns.time-1)” for fast rewind is not working.
the function containing this is called onPress by set interval & cleared the setInterval onRelease of the button…???

sm1 help me out of this…:*(