Direct Web Remoting

Using DWR, the protoype call above can be replaced by a DWR call:

   function zipChanged(zip) {
       if(zip.length != 5) {
           clearCityAndStateFields();
       }
       else {
           // A DWR call. See /WEB-INF/dwr.xml
           ZipCodes.getCityAndStateForZip(zip, processZipCodeSelection);
       }
   }