Magento Multiple Select Listbox Without Pressing CTRL

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Bids
8
Avg Bid (USD)
$87
Project Budget (USD)
$30 - $250

Project Description:
In Admin on the product edit page I need attributes with multiple select listboxes changed so CTRL key is not needed. Basically, the ability to just click multiple values on and off without holding down the CTRL key.

The reason for this request is one of product attributes has 20+ options and I want to eliminate the possibility of accidental clicks that would lose previous selections. If you have a better solution let me know. Thank you.

Magento CE 1.7.0.2

Skills required:
eCommerce, Javascript, jQuery / Prototype, Magento, PHP
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