Extracting cells from one array based on cells in another array

Hi and thanks in advance,

I have two arrays in a spreadsheet. I'll give an eg below ...

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How do I find the sum of all values in array two that correspond to a particular value in array one?
For eg...
- the number "2" in array one is in cells Aiii and Bii,
- cells Aiii and Bii from array one correspond to cells Aix and Bviii in array two
- therefore, the sum of cells corresponding to the number two is 10 ( from 4 + 6 = 10)

The result i want will show the following ...

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Cheers.

Josh

Jeez, that was a bit easy! Thanks Donkey!! Now i'll try applying that to an array a wee bit bigger.

Thanks again,

Josh