Counter Inside Select Statement?

Hi, can you add a counter inside a select statement to get a unique id line of the rows?

In my forum i have a page that displays a users past posts in the forum, these are first sorted according to their topicID and then they are sorted after creation date. What i want is in the select statement is to create a counter to get a new numeric order.

This is the normal way:

SELECT id, post, comment, created FROM forum_posts WHERE (topicID = @topicID) ... some more where/order by statements

This is what i want:

DECLARE @tempCounter bigint
SET @tempCounter = 0
SELECT @tempCounter, id, post, comment, created FROM forum_posts WHERE (topicID = @topicID)... some more where/order by statements and at the end.. (SELECT @tempCounter = @tempCounter + 1)

Anyone know if this can be done?