if döngüsünden önce eklemeyi deneyin..

<div class="sidebar1">      
<img src="http://www.abc.com/wp-content/themes/calligraphy_writing_ote021/calligraphy_writing_ote021/images/ara.jpg" width="%100">
<?php if (!art_sidebar(1)): ?>
<div class="Block">
...