<apex:pageBlockSectioncolumns="2">

       <apex:outputPanel><divid="accountDownloads"style="width: 650px; height: 400px;"></div></apex:outputPanel>

       <apex:outputPanel><divid = "accountTable"></div></apex:outputPanel>

          </apex:pageBlockSection>

</div>

The JavaScript here:

function accountData() {

var theJSON = {!AccountDownloadsJSON}; // This is the output JSON String from Controller

var chart = new AmCharts.AmPieChart();

chart.valueField = "NumberOfDownloads";  // These are fields which you would have mentioned in JSON String in controller.

chart.titleField = "RAAName";

chart.dataProvider = theJSON;

chart.minRadius = 130 ;

chart.urlField  = "RAAID";

chart.urlTarget  = "_blank" ;

chart.angle = 30;

chart.write('accountDownloads');   // This is your div Id in VF

}

The Controller:

public String getAccountDownloadsJSON() {

JSON.JSONList theJSON = new JSON.JSONList();

for(RAA__c raa : accounts) {

JSON.JSONMap accountJSON = new JSON.JSONMap();

accountJSON.put('RAAID', '/'+raa.Id);

accountJSON.put('RAAName', raa.Client_Name__c);

accountJSON.put('NumberOfDownloads', raa.Number_of_Downloads__c);

accountJSON.put('TotalDownloads', totalDownload);

theJSON.add(accountJSON); 

}

return theJSON.out().replace( ' "RAAID" ', 'RAAID').replace(' "NumberOfDownloads" ', 'NumberOfDownloads');

}

Cheers

Bramha