Hello Nux,
I uploaded all files for JSWikiGantt and prepared a test-page with your code example, but nothing happens. Due to version page of my wiki JSWikiGantt is installed.
I run MediaWiki 1.20, PHP 5.3.22 (cgi-fcgi).
As I can see in the source code of the test-page at least some script is included:
<script src="/cms/wiki/extensions/JSWikiGantt/jsgantt_inline.js?0"></script>
<script>
oJSGantInline.init()
oJSGant.AddTaskItem(new JSGantt.TaskItem(10, 'WCF Changes', , , '0000ff', 'http://your_bugzilla_domain.com/flyspray/index.php?do=details&task_id=10', 0, , 0, 1, 0, 1, , ))
oJSGant.AddTaskItem(new JSGantt.TaskItem(20, 'Move to WCF from remoting', '2010-07-11', '2010-07-15', '0000ff', 'http://your_bugzilla_domain.com/flyspray/index.php?do=details&task_id=20', 0, 'Rich', 10, 0, 10, 1, , ))
oJSGant.AddTaskItem(new JSGantt.TaskItem(30, 'add Auditing', '2010-07-19', '2010-07-21', '0000ff', 'http://your_bugzilla_domain.com/flyspray/index.php?do=details&task_id=30', 0, 'Mal', 50, 0, 10, 1, '20', ))
oJSGantInline.draw();
</script>
I'm somewhat new to mediawiki, so I don't know what to do further or where to look up, what's going wrong. I also searched for other extensions doing the same, but your extensions seems to me the right one. Help would be very nice. Thanks a lot. Epic.