I'm using: var s7_videoview = new s7viewers.VideoViewer();to instantiate a video player, and setting the caption parameter:s7_videoview.setParam( "caption", "http://s7d2.scene7.com/is/content/Delldev/VTT/dell_daac_hilton_h264%5F720p_800x450_1200k_de-de.vtt,1" );I'd like to be able to change the capt...