طلب تعديل بسيط على كود ليظهر بالوسط بدل اليمين

<?php
  $pub_no = "1111111111111111";
  $member_pub = $PowerBB->_CONF['template']['Info']['extrafield_1'];
  if(is_numeric($member_pub) && mb_strlen($member_pub)=='16' &&
$PowerBB->_CONF['template']['_CONF']['member_row']['username'] <> $PowerBB->_CONF['template']['Info']['username'])
{
$pub_no = $member_pub;
} ?>

<script type="text/javascript"><!--
google_ad_client = "pub-<?php echo $pub_no;?>";
google_ad_width=300;
google_ad_height=250;
google_ad_format="300x250_as";
google_ad_type="text_image";
google_ad_channel="forum";
google_color_border="FFFFFF";
google_color_bg="FFFFFF";
google_color_link="0000FF";
google_color_text="000000";
google_color_url = "008000";
//--></script>
<script type="text/javascript"
src="http://pagead2.googlesyndication.com/pagead/show_ads.js">
</script>