Just created this today. Simply upload the addon to your site and include: {addon_findbylistingID_link} to your main page in the left or right column. Sorry, I didn't use the language template, and there is no error message when a match is not found.
Mark
edit: for xhtml 1.0 strict, we need to make a simple change to the code at line 124. We need to add <p> and </p> to conform. You could place everything on 1 line as well.
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