This question has been asked multiple times, like here http://stackoverflow.com/questions/24145976/how-to-rewrite-extend-a-magento-class-in-an-existing-third-party-extensionhttps://stackoverflow.com/questions/24145976/how-to-rewrite-extend-a-magento-class-in-an-existing-third-party-extension and http://code.tutsplus.com/tutorials/understand-overriding-in-magento-blocks--cms-23325 and Rewrite a local Extension Module doesn't work
dotancohen
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replaced http://magento.stackexchange.com/ with https://magento.stackexchange.com/