I'd do 2 or 3 mortices each end of the centre piece. You could also do the pegged tenon like so http://i24.photobucket.com/albums/c32/Eventual420/MortiseTenonPeg.jpg But that depends on the finish you're after.
@O'Shane started
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I'd do 2 or 3 mortices each end of the centre piece. You could also do the pegged tenon like so http://i24.photobucket.com/albums/c32/Eventual420/MortiseTenonPeg.jpg But that depends on the finish you're after.