SQL Server Self Joins

Hi,

I have a table called Test with columns questionid,text,qid

basically qid also a questionid which is a help text for the main question. questions
which does not have help text will have qid as NULL

now i want to retrive all questionid's with the question text but those questions which has
qid I want that text for qid in the same row . so basically I want the question text and the  qid
text (help text) in the same row for each questionid. for those questions where qid is null should return null. and I dont want the qid questionid's appearing as seperate questions in my result sets.

Example

questinid   text                         qid
101         what is ur name ?     102
102         this is mandatory       null
103         DOB                             null

so my result set should be like below :

questionid   text                        helptext
101          What is ur name ?    this is mandatory
103          DOB                           null



can some one please advise me the best query for this ?

Many Thanks