Pagination with a List Controller

<apex:page standardController="Account" recordSetvar="accounts" extensions="AccountPagination">  <apex:pageBlock title="Viewing Accounts">  <apex:form id="theForm">    <apex:pageBlockSection >      <apex:dataList var="a" value="{!accountPagination}" type="1">        {!a.name}      </apex:dataList>    </apex:pageBlockSection>    <apex:panelGrid columns="2">      <apex:commandLink action="{!previous}">Previous</apex:commandlink>      <apex:commandLink action="{!next}">Next</apex:commandlink>    </apex:panelGrid>  </apex:form>   </apex:pageBlock></apex:page>