使用Javascript动态着色美国地图

I need to write a webpage which starts with a blank map of the US and colors the states according to data it receives from various Ajax requests. The map needs to change over time without the page reloading, and the user can click on various controls to instantly change how the map is colored. This all needs to be done locally, so I can't make use of Google maps or any similar internet service.I need to write a webpage which starts with a b