Breakdown results by month

I have the ff table:

id       |    total    |     effective        |    end_date
john          6              01-01-2005        02-28-2005
john          8              03-01-2005        06-30-2005

How can I return:
id       |    total    |     effective        |    end_date
john          6              01-01-2005        01-31-2005
john          6              02-01-2005        02-28-2005
john          8              03-01-2005        03-31-2005
john          8              04-01-2005        04-30-2005
john          8              05-01-2005        05-31-2005
john          8              06-01-2005        06-30-2005

Any help would be appreciated. Thanks