I'm trying to insert the company logo so that it appears on all my documentation , invoices, eMails etc. I have been successful with the vast majority of the files but for some reason I can't get the email_extras.php file to accept it. Everytime I place the following html

<tr>
<td class="pageHeading"><?php echo nl2br(STORE_NAME_ADDRESS); ?></td>
<td class="pageHeading" align="right"><img src="http://www.thetrailingedge.com/includes/templates/Tte/images/tte_ca.jpg" /></td>
</tr>

My site goes down and a white blank page appears. I immediately replace the original file and all comes back.
Can someone tell me where/or what line do I insert the code. It works fine when tested on different browsers and within CoffeCup HTML editor.
Thanks,