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how can you tell? thanks

I think only the MBP's had the built in iSight and the IR sensor on the front of the machine - correct me if I'm wrong.

And the space around the trackpad doesn't look big enough to be the 17" - therefore, it must be a 15"... maybe :)
 
I think only the MBP's had the built in iSight and the IR sensor on the front of the machine - correct me if I'm wrong.

And the space around the trackpad doesn't look big enough to be the 17" - therefore, it must be a 15"... maybe :)

The size of the speaker grills is a better thing to look at.
 
You can also see the MagSafe in the picture. You can see that its rectangular, and not round like the older models. So, that tells you its a MBP.

Then, as others said, the speaker grill and Superdrive slot give the 15" away.
 
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