gchart_available_areas
                        Get available areas
gchart_cache_dir        Verify cache directory
gchart_generate_us_areas
                        Generate Google Charts spatial data for US
                        areas
gchart_get_cache_path   Get the cache path
gchart_get_us_areas     Get Google Charts data for US areas
gchart_process_us_areas
                        Process Google Charts data for US areas
gchart_set_cache        Set up a cache directory
