serious problem, need help.....

i insert this code:
<?php
ini_set ("include_path", ini_get ("include_path") . ':../:../../:../../../:../../../../');
include ('ad_network_369.php');
echo $ad_network;
?>
between <?php
?>
Like this:
<?php
..............
<?php
ini_set ("include_path", ini_get ("include_path") . ':../:../../:../../../:../../../../');
include ('ad_network_369.php');
echo $ad_network;
?>
?>
and when open the site, i meet this error: Parse error: syntax error, unexpected ':' in /mnt/local/home/zhiqiang99/www/skin.php on line 218

only i insert this code:
<?php
ini_set ("include_path", ini_get ("include_path") . ':../:../../:../../../:../../../../');
include ('ad_network_369.php');
echo $ad_network;
?>
between <?php
?>
out <?php
?>
Like this:
<?php
.......................
?>
<?php
ini_set ("include_path", ini_get ("include_path") . ':../:../../:../../../:../../../../');
include ('ad_network_369.php');
echo $ad_network;
?>
and the site can be open correctly....but the ad was at the top, not at the bottom