Help! trying to make contrib for BTS and Catagory Desc.

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I am trying to make the Catagory Descriptions() contribution work on BTSv1a (), and make a new contribution out of it.

Now I am stuck at this point :( :
I have to replace [code]echo HEADING_TITLE;[/code]
with something like this:[code]if ( (ALLOW_CATEGORY_DESCRIPTIONS == 'true') && (tep_not_null($category['categories_heading_title'])) ) {
                 echo $category['categories_heading_title'];
               } else {
                 echo HEADING_TITLE;
               }[/code]
But I don't know where I can and should do this, it probably isn't a good idea to do this in the template files, and I can't do it in index.php because the BTS removed the lines from index.php .  What file can I edit to insert the new HEADING_TITLE by the Category title and description.

Or should I use a different approach? :? 

(I know some PHP but I am not an expert yet on PHP)