getSelectValue to retrive the internal id of a list value

I am trying to set the value of buyingTimeframe field on a customer record.
I need to set "Less than 1 month" in the Buying time frame field.
I am able to get all the values in the buyingTimeframe list, but I am not able to get the internal id of those values.
Can anyone show how to get the internalid of a value on a list.
Any help is greatly appreciated.

Thanks!

 GetSelectValueFieldDescription myGSVField = new GetSelectValueFieldDescription();  myGSVField.setField("buyingTimeFrame");  myGSVField.setRecordType(RecordType.customer);    GetSelectValueResult result = _port.getSelectValue(myGSVField, 1);  BaseRef[] refs = result.getBaseRefList().getBaseRef();    for (int j = 0; j < refs.length; j++) {   System.out.println("refs.length "+refs.length +" ---" +refs[j].getName());   if(refs[j].getName().equals(lineValue.buyingTimeframe)){        RecordRef buyingTimeFrame = new RecordRef();    buyingTimeFrame.setName(refs[j].getName());    //buyingTimeFrame.setInternalid ?????        System.out.println("got the list value:" +refs[j].getName());    customer.setBuyingTimeFrame(buyingTimeFrame);    break;   }  }