Convert ExtJS 3 Code to EXTJS 4 beta

Here is the page with display: [login to view URL] Here is the JSON and JS file. [login to view URL] [login to view URL] (The number of reps can and will change, the JS needs to be able to handle dynamic nature of this file.) EXTJS 4 framework can be found here: [login to view URL] e.g. [login to view URL] [login to view URL]