facebook fql query limit not working as expected

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Facebook-API

Hi
i want to get comments for a facebook post in certain interval using facebook fql query.say there are 300 comments on this post and i want to show comments starting from 100 to 200 of the 300 comments.
there are many strange behaviour by the "limit" and "offset" field like say i have 50 comments if i use -

SELECT text,post_id  FROM comment  WHERE post_id="22196_1015133070997" LIMIT 50 offset 25

it returns first 25 comments and i couldn't make it reverse like showing comments starting 25 to 50.anyway what i want i wrote in first 3 lines.i am totally lost in researching on how to do that.kindly help me..asap

Thanks