Here's an example of a World map linked to a US map (click on the United States):
Download the above demo and reference the source code as I explain how the above example was created.
Customize your US map and World Map independently.
Rename the US mapdata.js file to mapdata_us.js so that it doesn't conflict with the World mapdata.js file.
In the mapdata_us.js file set auto_load: 'no',. This will keep the US map from loading until it is clicked.
In the mapdata_us.js file set
This will make the back button will appear after the US has been clicked. Clicking on this button will take the user back to the world map.
<script src="mapdata.js"></script> <script src="mapdata_us.js"></script> <script src="worldmap.js"></script> <script src="usmap.js"></script>
That's it. Your two maps should now be linked!