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I have a configurable product with 3 options, see below:

I want to replace the +£24.00 and the +£75.00 with the actual prices of the products.
So instead it would say: £69.00 and £120.00
I have located the code being in js/varien/product.js
I've spent a bit of time chopping and changing the code, but can't quite decipher what needs to change. Line 240 downwards in this file handles the JavaScript events for configurable products.