javascript for my website simple -- 2

The following needs to be achieved When you are logged in you need to select 'Religion' from the drop down menu. This will populate the select boxes with regions which you can then select. You job is to redo this element. ONLY this element (and the map) and to clean up the code. Currently I have limited the results to 100 as otherwise the browser crashes. I need to have the ability to show well over 50,000 results. Perhaps load it as the you scroll down or load the subheadings dynamically. I realize this will require changes in the API. Simply let me know how you want the data and I will fix the JSON side. You also need to make sure that the map runs in sync with the select box. Currently if you select religion you will see at the top of Australia regions which can be selected. You need to make it so that these highlight when selected and go back to normal when unselected. This map just runs of a basic leaflet map and regions are retrieved using prepared GeoJSON.