Placing the code in overall_header.tpl doesnt really help at all to the most part.
This is what you shoudl do
1.) Navigate to $phpbb_root_path/includes
2.) Located page_header.php
3.) Open page_header.php
4.) In page header located these lines below.
PHP:
header ('Expires: 0');
header ('Pragma: no-cache');
$template->pparse('overall_header');
5.) If your hosting plan is corporate change it to this.
PHP:
header ('Expires: 0');
header ('Pragma: no-cache');
$template->pparse('overall_header');
echo "<script language='JavaScript' type='text/javascript' src='http://x10hosting.com/advert/adx.js'></script>\n";
echo "<script language='JavaScript' type='text/javascript'>\n";
echo "<!--\n";
echo "if (!document.phpAds_used) document.phpAds_used = ',';\n";
echo "phpAds_random = new String (Math.random());\n";
echo "phpAds_random = phpAds_random.substring(2,11);\n";
echo "document.write (\"<\" + \"script language='JavaScript' type='text/javascript' src='\");\n";
echo "document.write (\"http://x10hosting.com/advert/adjs.php?n=\" + phpAds_random);\n";
echo "document.write (\"&what=zone:1&target=_blank\");\n";
echo "document.write (\"&exclude=\" + document.phpAds_used);\n";
echo "if (document.referrer)\n";
echo "document.write (\"&referer=\" + escape(document.referrer));\n";
echo "document.write (\"'><\" + \"/script>\");\n";
echo "//-->\n";
echo "</script><noscript><a href='http://x10hosting.com/advert/adclick.php?n=a7fb3e9d' target='_blank'><img src='http://x10hosting.com/advert/adview.php?what=zone:1&n=a7fb3e9d' border='0' alt=''></a></noscript>\n";
6.) If your hosting plan is advanced change it to this.
PHP:
header ('Expires: 0');
header ('Pragma: no-cache');
$template->pparse('overall_header');
echo "<script language='JavaScript' type='text/javascript' src='http://x10hosting.com/advert/adx.js'></script>\n";
echo "<script language='JavaScript' type='text/javascript'>\n";
echo "<!--\n";
echo "if (!document.phpAds_used) document.phpAds_used = ',';\n";
echo "phpAds_random = new String (Math.random());\n";
echo "phpAds_random = phpAds_random.substring(2,11);\n";
echo "document.write (\"<\" + \"script language='JavaScript' type='text/javascript' src='\");\n";
echo "document.write (\"http://x10hosting.com/advert/adjs.php?n=\" + phpAds_random);\n";
echo "document.write (\"&what=zone:3&target=_blank\");\n";
echo "document.write (\"&exclude=\" + document.phpAds_used);\n";
echo "if (document.referrer)\n";
echo "document.write (\"&referer=\" + escape(document.referrer));\n";
echo "document.write (\"'><\" + \"/script>\");\n";
echo "//-->\n";
echo "</script><noscript><a href='http://x10hosting.com/advert/adclick.php?n=a915c788' target='_blank' class=forumlink><img src='http://x10hosting.com/advert/adview.php?what=zone:3&n=a915c788' border='0' alt=''></a></noscript>\n";
echo "\n";
echo "\n";
That should fix the problems in your phpbb ads.