Hi,
try this:
I have made this two pieces (make a backup of the two files in your mambo Template) just copy it over the two pieces in the template folder of your site (be sure to be in the right one). After that Look if the site work properly. If it doesn´t work, copy over the backup. Then we have to look for another solution.
Hope your understand what i wrote
Let me know if this works.
Here are the two pieces.
regards Pepe