GtkWidget *window;
GtkWidget *options_window;
GtkWidget *about_window;
GtkWidget *popup_window;
GtkWidget *status_bar;
GtkWidget *vbox;
GtkWidget *menu;
GtkWidget *host_entry;
GtkWidget *host_combo;
GtkWidget *trace_button;
GtkWidget *latlon_label; 
GtkWidget *map_combo_entry;
GtkWidget *map_combo;
GtkWidget *drawing_area;
GtkWidget *trace_list;
GtkWidget *scrolled_window;
GtkWidget *scrolled_window2;
GtkWidget *trace_path_entry;
GtkWidget *max_ttl_spinbutton;
GtkWidget *timeout_spinbutton;
GtkWidget *trace_selection_dialog;
GtkWidget *resolve_checkbox;
GtkWidget *map_dir_path_entry;
GtkWidget *start_map_entry;
GtkWidget *start_map_combo;
GtkWidget *color_select_dialog;
GtkWidget *display_color_label2;
GtkWidget *display_color_select_button;
GtkWidget *line_width_spinbutton;
char *popup_msg;

void create_window(void);
void create_options_window(void);
void create_about_window(void);
void create_popup_window(void);
void create_trace_select_dialog(void);
void create_color_select_dialog(void);