Ajax tabs problem

[versus]

(Ajax Tabs (http://www.dynamicdrive.com/dynamicindex17/ajaxtabscontent/index.htm))

FF error console shows me the following error:

ulobj has no properties

It's at this line:

var ulist=ulobj.getElementsByTagName("li") //array containing the LI elements within UL

What is it and how can i fix it ?

[versus]

I think it happens in pages i don't use the ajax tabs, but the problem is that the JS called in a header template which is used on all site's pages (including pages that doesn't use it).

[ddadmin]

Please post a link to the page on your site that contains the problematic script so we can check it out.

[versus]

http://www.versus2.com/1.gif

The error appears on many pages where it's not used.. You can browse it by clicking the options at the top purple bar (or change to english at the top left if you want)