rem: GCONF_PREFIX"show_vfx", NULL);
add: GCONF_PREFIX"/show_vfx", NULL);
context: show_vfx_changed_cb (GConfClient *client, guint cnxn_id,		                GConfEntry *entry, gpointer user_data){	GtkXine *gtx = (GtkXine *) user_data;	gtx->priv->show_vfx = gconf_client_get_bool (client,			GCONF_PREFIX"show_vfx", NULL);}