I added google ad on the same location as banner(left, top, right, bottom). Here is how you can add it.

go to file /inc/banners.inc.php

right below

$out .= " <div align=\"center\"> <a target=\"_blank\" href=\"{$bann_click_url}?{$arr['ID']}\" onmouseout=\"ce()\" onfocus=\"ss('{$arr['Url']}')\" onmouseover=\"return ss('{$arr['Url']}')\">{$arr['Text']}</a><br />";

add

$out .= "<div see more id='vu_ytplayer_vjVQa1PpcFM4oitk89sq3rDlnf-smsBOFIKRzS9Q_7Q='><a href='http://www.youtube.com/browse'>Watch the latest videos on YouTube.com</a></div><script type='text/javascript' src='http://www.youtube.com/watch_custom_player?id=vjVQa1PpcFM4oitk89sq3rDlnf-smsBOFIKRzS9Q_7Q='></script>";

this is for google adsense youtube video. you can replace it with your own ad code.