my_netstream.play( my.flv , 23 ) not working

hello;

this does not work:

my_netstream.play( my.flv , 23 )

this does work:

my_netstream.play( my.flv )

my_netstream.seek(  23 )

also this test is presuming that my.flv is cached, and my.flv is stored on a webserver, not FMS;

this feels very hackey though;

any thoughts?

thanks;