====== How to? Customize frontend template (F.e. review.phtml of onepage checkout) ======

We want to overwrite review.phtml of onepage checkout to provide f.e. terms and conditions download.

We created our own module called Mymodule. At first we have to create new layout xml for this module. we copy checkout.xml layout from design/frontend/default/default/layout/checkout.xml to design/frontend/default/default/layout/mymodule.xml and overwrite layout of checkout in our config.xml

<code xml>
        <layout>
             <updates>
                  <checkout>
                        <file>mymodule.xml</file>
                  </checkout>                  
             </updates>
        </layout>    
</code>

Then we change code of our layout to load our own template. Our customized template is located in /design/frontend/default/default/template/mymodule/onepage/review.phtml

Change in mymodule.xml

<code xml>
<block type="checkout/onepage_review" name="checkout.onepage.review" as="review" template="checkout/onepage/review.phtml">
                    <block type="checkout/onepage_review_info" name="checkout.onepage.review.info" as="info" template="checkout/onepage/review/info.phtml"/>
                </block>
<code>

to

<code xml>
<block type="mymodule/onepage_review" name="termsandconditions.onepage.review" as="review" template="mymodule/onepage/review.phtml">
                    <block type="checkout/onepage_review_info" name="checkout.onepage.review.info" as="info" template="checkout/onepage/review/info.phtml"/>
                </block>
</code>