the fastest way is redifine the root template for those routes in a local.xml:
[root]/app/design/frontend/{your_package}/{your_theme}/layout/local.xml
Then apply this:
<reference name="root"> <action method="setTemplate"><template>page/{your_template}.phtml</template></action> </reference>
to all "product-list" related routes, these are:
<catalog_category_default/> <catalog_category_layered/> <catalogsearch_result_index/> <catalogsearch_advanced_result/>
for "product-view"
<catalog_product_view/>
So for the catalog_product_view route the complete code would be:
<?xml version="1.0"?> <layout> <catalog_product_view> <reference name="root"> <action method="setTemplate"><template>page/{your_template}.phtml</template></action> </reference> </catalog_product_view> ... other routes ... </layout>