possible bug in footer

now using 5.1 and i see under default theme u can add logo, header and footer
now if you have like me already coded the bottom from the layout_phtml then what ever you put in the footer does`nt work.

on mine i have (layout)

Code:

<div class="am-footer-actions">
                        <a href="#top"><img src="<?php echo $this->_scriptImg('/top.png') ?>" /></a>
                    </div>
                    <div id="main-content">
Welcome to 3wows
</div>
<script type="text/javascript" src="/advertisement.js"></script>
<script type="text/javascript">
if (document.getElementById("testadblock") == undefined)
{
document.getElementById('main-content').innerHTML="It seems you have adblock enabled, please disable AdBlocker and <a href=''>refresh this page</a> to see helpful images";
}
</script>
</a>
                </div>
            </div>
        </div>
        <?php echo $this->placeholder('body-finish'); ?>

this worked as asking people to remove ad-block as some images would not load ( sorted some by diff names and in folder )
but now updated to 5.1, if you remove ad-block and refresh, the writing wont change like it did before.