<?php $i=1; ?>
<?php while($sonuc4=mysql_fetch_array($query4)){ 

	if($i<=5){?>
        <ul class="blog column column_1_2"> 
        <li class="post"> 
               //içerik                        
        </li> 
	<?php  
           }
           if($i==5)echo '</ul><ul class="blog column column_1_2">';
           if($i>5){ ?>
        <li class="post"> 
              //içerik                         
        </li> 
	<?php } ?>
	<?php $i++; } ?>
	</ul>