Mediawiki 1.11 (TINMW) setup problem


We are currently working on getting a new website online. We are using joomla 1.0.13, PHP, mysql and a joomla plugin for MediaWiki 1.11 (TINMW). When we try to configure the wiki on the site, we get the following error:

Parse error: syntax error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or ‘}’ in /home/.sympathy/…webaddress/administrator/components/com_tinmw/admin.tinmw.html.php on line 26

Our application works fine in our laptops/desktops, so it is not an application problem. On searching in google, we realized that it could be due to difference in PHP versions. We are using PHP5 at our machines.

Can you please suggest a way out of this problem.