Restricting base map on specific extent in ArcGIS API for JavaScript 3?

Currently I am using ArcGIS JS API ver 3.3/3.5 in my application.

I want to restrict the basemap for US only .For example one can use default navigation features like zoom in, zoom out for the US Country only.

Trying following things:

1. 
   

   I have set the US extent code in my application but when I zoom out then I can see the whole world map I want to restrict it to certain extent only

   
   


2. 
   

   Going through this question: Restrict pan and zoom in ArcGIS Javascript API?

   
   


3. 
   

   Restricting the streets basemap using this question, but unable to restrict the map: Using own basemap with ArcGIS API for Javascript?

   
   


4. 
   
   

   I am using this sample map in my application.

   
   

Answer

Here is an example of one way to do this: http://jsfiddle.net/gh/gist/library/pure/6050806/