Why am I getting a white area?

[dmagic]

<!-- AddThis Button BEGIN -->
<div class="addthis_toolbox addthis_default_style ">
<a class="addthis_button_preferred_1"></a>
<a class="addthis_button_preferred_2"></a>
<a class="addthis_button_preferred_3"></a>
<a class="addthis_button_preferred_4"></a>
<a class="addthis_button_compact"></a>
<a class="addthis_counter addthis_bubble_style"></a>
<script type="text/javascript" src="http://s7.addthis.com/js/300/addthis_widget.js#pubid=ra-4d9f0913528c8e79"></script>
<!-- AddThis Button END -->
   <?php echo '<a href="' . zen_href_link(FILENAME_ASK_A_QUESTION, 'products_id='
   . $_GET['products_id']) . '">' .   zen_image_button(BUTTON_IMAGE_ASK_A_QUESTION, BUTTON_ASK_A_QUESTION_ALT) .
   '</a>'; ?>

</div>

 <!--bof Product description -->
<?php if ($products_description != '') { ?>
<div id="productDescription" class="productGeneral biggerText"><?php echo stripslashes($products_description); ?></div>
<?php } ?>
<!--eof Product description -->

Why i get this ?