Intenta esto:
<div id="bodyWrapper2" style="overflow:hidden;width: 300px">
<div class="barLeft" style="float:Left; width: 10px;">a</div>
<div class="barMiddle" style="float:left; width:280px;">
<div id="bodyWrapper">
<div id="header3">
{% include base/base.tabs %}
</div>
<div id="pageBody">
{% block BODY %}{% end %}
</div>
<div>
<?php echo locale::_('FOOT_COPY', array('{date}' => '2003-' . date('Y'))); ?>
</div>
</div>
</div>
<div class="barRight" style="float:Left; width: 10px;height:100%;">b</div>
</div>
Saludos!