Magento Hosting : Overriding checkout cart without copying all code

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This magento discussion was started by mrpunkin on 07 April 2009

Can someone please explain in detail the steps I need to take to override the default indexAction method in Mage_Checkout_CartController with my own modules code where I can add the few lines I need and still reference parent::indexAction()? I finally got this working where it functions correctly, but now when it has to redirect to the cart it redirects to simplecheckout/cart/index in the URL instead of checkout/cart. This is unacceptable. It needs to redirect at all times to the right place and URL. Can anyone help me figure out what I am doing wrong here?

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