[devote]

<div id="jm-maincontent" class="clearfix">
  <div id="system-message-container"> </div>
  <script type="text/javascript"></script>
  <style type="text/css"></style>
  <div class="jm-module"></div>
  <div class="album_descr">дескриптион<div>nhfnfnf</div></div>
  <table class="thumbs"></table>
  <div style="display: none;"></div>
  <div style="clear: both; text-align: center;opacity: 0.3; margin: 20px 0 0 0;">Это копирайт</div>
</div>

<script type="text/javascript">
    document.querySelector('#jm-maincontent > div:last-child').style.display='none';
</script>