Checkout Method

you could go to the app\design\frontend\base\default\layout\jmquickvie w.xml file to find this block

HTML Code:

  <block type="core/text_list" name="checkout.cart.top_methods" as="top_methods" translate="label">
                    <label>Payment Methods Before Checkout Button</label>
                    <block type="checkout/onepage_link" name="checkout.cart.methods.onepage" template="checkout/onepage/link.phtml"/>
                </block>

here I think you can change the check out block type here

HTML Code:

   <block type="checkout/onepage_link" name="checkout.cart.methods.onepage" template="checkout/onepage/link.phtml"/>

what do I change this to? I changed the template to onepagecheckout/onepage/link.phtml and it results in an error. I am using IWD One Page Checkout.

It would be best if you can contact the IWD One Page Checkout developer to get better instruction on the exact link to be added there.