public String selectedContact {get;set;}
     
    public List<SelectOption> cardList;
   
    public List<SelectOption> getGiftCard ()
    {
        POS__c posclt = [select Client__c from POS__c where id = :ApexPages.currentPage().getParameters().get('TId')];
        if (contactList == null)
        {
         GiftCertificate__c[] gcard = [select Id,Name,GiftCardNo__c,Remaining__c,ExpiresOn__c
                        from GiftCertificate__c where Purchasedfor__c =: posclt.Client__c and ExpiresOn__c >=:System.today() and Remaining__c>0];           
         cardList = new List<SelectOption>();
         for(GiftCertificate__c gc : gcard)
         {
            cardList.add(new SelectOption(gc.id, gc.GiftCardNo__c));
         }
        }
        return cardList;
    }