jwplayer从播放列表上的第n个视频开始？

jwplayer(\"placeholder1\").setup({

                    autostart: true,
                    flashplayer: \"/scripts/player/player.swf\", 
                    playlist: [<?=rtrim($flashList, \',\')?>], /* \"playlist.position\": \"bottom\", \"playlist.size\": 60, */
                    width:640,
                    height: 445,
                    controlbar: \"bottom\",
                    repeat: \'list\' 

});