+browse_image_dir_cb (GtkButton *button,
+ gpointer user_data);
+
+void
+settings_switch_page_cb (GtkNotebook *notebook,
+ GtkNotebookPage *page,
+ gint page_num,
+ gpointer user_data);
+
+void
+manual_cb (GtkButton *button,
+ gpointer user_data);
+
+void
+settings_adv_cb (GtkButton *button,