popup visualforce shows no data

Please refer the code below which will open a popup with a parameter from the parent page.

<apex:page standardcontroller="Account" extensions="acctControllPopup" sidebar="false" > 
<apex:sectionheader title="UCF Review" /> 
<apex:messages />
 <apex:form rendered="{!displaySection}"> 
<script type="text/javascript"> 
function LegalNameChangePopup(nameId){
var name = document.getElementById(nameId).value;
var url="/apex/popQuestionPagewhichWillOpen?namePp=" + name;
var newwindow = window.open(url,'Popup','height=500,width=600,left=100,top=100,resizable=no,scrollbars=yes,toolbar=no,status=no'); 
newwindow.focus(); } 
</script>
 <apex:pageblock title="General Information" > 
<apex:pageblocksection title="Legal Name"> 
<apex:inputText size="40" value="{!accountName}" id="targetName"/>
<apex:panelgrid columns="2"> 
<!-- <apex:outputlabel value="Account Name: " for="accountName" />-->
 <apex:outputfield id="accountName" value="{!account.name}"/>
 <apex:commandbutton value="Edit" id="accpopup" onclick="LegalNameChangePopup('{!$Component.targetName}');" styleclass="btn"/>
 </apex:panelgrid>
 </apex:pageblocksection> 
</apex:pageblock> 
<apex:pageblock > 
<apex:pageblocksection columns="4"> 
<apex:commandbutton action="{!step2}" value="Save and Continue" styleclass="btn" />
 <apex:commandbutton action="{!reset}" value="Reset Page" styleclass="btn" immediate="true"/>
 </apex:pageblocksection>
 </apex:pageblock> 
</apex:form>
 </apex:page>

public with sharing class acctControllPopup {
    public string accountName{get;set;}
    public string namePara{get;set;}
    Public string namePp;
    public string nameAcct;
    public acctControllPopup(ApexPages.StandardController controller) {
        displaySection=true;
        nameAcct= ApexPages.currentPage().getParameters().get('namePp');
        nameAcct= '%'+nameAcct+'%';
        system.debug('nameAcct '+nameAcct);
        aAccount = [Select Id,Name from Account where name like :nameAcct];
    }
    public List<account> aAccount{get;set;}
    public boolean displaySection{get;set;}
    public pageReference step2(){
    return null;
    }
    public pageReference reset(){
    return null;
    }
    public pageReference setPara(){
    //pageReference pageRef = new pageReference('/apex/popQuestionPagewhichWillOpen');
    //pageRef.getParameters().put('namePp', namePara);
    return null;
    }
}