rem: if (!gtk_xine_can_set_volume (GTK_XINE (totem->gtx)))
add: if (gtk_xine_can_set_volume (GTK_XINE (totem->gtx)) == FALSE)
context: totem_action_volume_relative (Totem *totem, int off_pct){	int vol;	if (!gtk_xine_can_set_volume (GTK_XINE (totem->gtx)))		return;	vol = gtk_xine_get_volume (GTK_XINE (totem->gtx));	gtk_xine_set_volume (GTK_XINE (totem->gtx), vol + off_pct);	volume_set_image (totem, vol + off_pct);}