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Pretty certain the big ring is correct. The leading edge of the teeth appear to be pointing in the right direction. The granny ring teeth look like they might be facing the opposite way, not sure tho? Does it matter? [IMG] 
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When you pedal it, does it go backwards or forwards?
writing on the chainring pointing outwards usually and inwards on the inner ring(s)
Or, go with the ramps, which is far more sensible. The ramps on the big ring should be on the inboard side. No ramps on the wee ring, best bet is to keep switching the inner round now and again, to get a wee bit more life out of it.
Here you are Paul, writing on the granny ring facing the bb...
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Cheers Si, just having a moment of doubt, but it's fine going on your pic. Also I'm used to having a lip on the inside as per your pic, but there isn't one on this granny (I think it's slx)