0001 - preprocessor.php

<?php
/**
 * Tell page.tpl.php whether or not to show the sticky player
 */
function olympics_degradation_states_preprocess_page(&$vars) {
  $vars['disable_sticky_player'] = variable_get('disable_sticky_player', FALSE);
}

0002 - page.tpl.php

<?php
/**
 * PHP template file 
 */
?>
<header>
<?php if (!$disable_sticky_player): ?>
<div>
  <iframe src="http://example.com/sticky-player-embed/12345"/>
</div>
<?php endif; ?>
<nav>
  <ul class="main-nav">
    <li><a href="#">Nav Item 1</a></li>
    <li><a href="#">Nav Item 2</a></li>
    <li><a href="#">Nav Item 3</a></li>
    <li><a href="#">Nav Item 4</a></li>
    <li><a href="#">Nav Item 5</a></li>
  </ul>
</nav>
</header>

0003 page.html

<!-- Final output show to the user  -->
<header>
<nav>
  <ul class="main-nav">
    <li><a href="#">Nav Item 1</a></li>
    <li><a href="#">Nav Item 2</a></li>
    <li><a href="#">Nav Item 3</a></li>
    <li><a href="#">Nav Item 4</a></li>
    <li><a href="#">Nav Item 5</a></li>
  </ul>
</nav>
</header>