make configurable product options available in a magento template

Avg Bid (USD)
Project Budget (USD)
$30 - $250

Project Description:
We have a custom template for a magento webshop. on the productpage customers can choose product options, in the backend this is done by custom options. however the product options should be handled by configurable product options. this needs to be changed in the template. and the result should look the same. this is an easy change.

the example can be seen under:

where "eenheid" now is populated by a custom option and it should be populated from a configurable product.
The way it is displayed should stay the same.
The configurable products are already created in the backend.

Skills required:
HTML, Magento, PHP, Website Design
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