Display out of stock products at last in search result Magento

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Bids
7
Avg Bid (USD)
$33
Project Budget (USD)
$30 - $30

Project Description:
Magento is displaying out of stock products in search result. I would like to change this behavior so that my website displays out of stock products always at last of the raw in a search result. This customization can not affect the peformance of the extension I´m using "Blast Lucene Search".
URL is [url removed, login to view]

Can anyone help me out?

Skills required:
Magento
Additional Files: Untitled-1.jpg
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