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Custom button doesn't redirect on VF page correctly

Hi Guys!I wrote this custom controller to create a custom button new for my custom object Family__c that has two lookup relations one on account and an other on opportunity.
I need to rebuild in my controller this url
&CF00N4E000000MBfn={!Account.Name}&CF00N4E000000MBfn_lkid={!Account.Id}&retURL=%2F{!Opportunity.Id}  in order to have the new Family__c record page with lookup fields automatically filled.
This is my controller
public without sharing class Guest_Stud_BottonCtrl {</span>
  public Family__c hfs { get; set; } 
  public Opportunity opp{ get; set; }
  public String opp1{ get; set; }
  public String retURL {get; set;}
  public String saveNewURL {get; set;}

  public String opps {get; set;}
  public String cancelURL {get; set;}
  public String ent {get; set;}
  public String confirmationToken {get; set;}

  public Guest_Stud_BottonCtrl (ApexPages.StandardSetController controller) {
   hfs = (Family__c)controller.getRecord();
  // Id Opportunity_Id = [SELECT Id FROM opportunity WHERE AccountId=:Account_Id  LIMIT 1].id;
  Id Opportunity_Id=ApexPages.CurrentPage().getParameters().get('');
   Id Account_Id = ApexPages.CurrentPage().getParameters().get('');
   retURL = ApexPages.currentPage().getParameters().get('retURL');

       opps=[SELECT Id FROM opportunity WHERE AccountId=:Account_Id  LIMIT 1].id;
        cancelURL = ApexPages.currentPage().getParameters().get('cancelURL');

        ent = ApexPages.currentPage().getParameters().get('ent');
        confirmationToken = ApexPages.currentPage().getParameters().get('_CONFIRMATIONTOKEN');

        saveNewURL = ApexPages.currentPage().getParameters().get('save_new_url');

public PageReference urlredirect() {

  PageReference newPage;

  PageReference returnURL;

            returnURL = new PageReference('/a04/e');

            returnURL.getParameters().put('retURL', retURL);

            returnURL.getParameters().put('', opps);

            returnURL.getParameters().put('cancelURL', cancelURL);

            returnURL.getParameters().put('ent', ent);

            returnURL.getParameters().put('_CONFIRMATIONTOKEN', confirmationToken);

            returnURL.getParameters().put('save_new_url', saveNewURL);

            returnURL.getParameters().put('nooverride', '1');


            return returnURL;


the problem is that when I launch the button the page redirect on standard  page new family__c record and doesn't fill the lookup field automatically as I want.
Where am I wrong?
Anyone could help me please?