Moving ADV placeholders on page

<script type="text/javascript">
<!--
    function tell_toggle_visibility(id) {
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       if(e.style.display == 'block')
          e.style.display = 'none';
       else
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//-->
</script>
<a href="#">
<img style="-webkit-user-select:none; display:block; margin:auto;" src="http://docs.tellnet.it//download/attachments/9798103/SMALL+BANNER.jpg?version=1&amp;modificationDate=1477922382210" align="left" onclick="tell_toggle_visibility('tell_video');">
</a>
<br style="clear: both;">
<div style='display:block'></div>
<div id="tell_video" style='display:none'>
<iframe width="960" height="540" src="https://www.youtube.com/embed/Dr_S2NjGujY?rel=0&amp;showinfo=0" frameborder="0" allowfullscreen></iframe>
</div>