.Classic used Javascript includes like this:
Code
<SCRIPT src="http://www.gangsterbb.net/ubb/ContentIslands/1/html.js"
language="Javascript1.3" type="text/javascript"></SCRIPT>
and worked fine on other domains...

GangsterBB.NET (Ver. 7.6.1.1)
PHP Version 5.6.40 / MySQL 5.7.23-23 (was 5.6.41-84.1) / Apache 2.4.54
2007 Content Rulez Contest - Hon Mention
UBB.classic 6.7.2 - RIP