SW/Catalog/etc/config.xml

config.xml

<?xml version="1.0" encoding="UTF-8"?>
<config>
    <modules>
        <SW_Catalog>
            <version>0.1.0</version>
        </SW_Catalog>
    </modules>
    <global>        
	<helpers>
            <catalog>
                <rewrite>
		    <product_view>SW_Catalog_Helper_Product_View</product_view>
		</rewrite>
            </catalog>
        </helpers>
    </global>
</config>