Javascript error - SXBB[id].resize is not a function

My forum (based on phpbb3) has a Javascript error that I'd like to resolve. In FF and IE the following error occurs:

Error: SXBB[id].resize is not a function
Source File: http://digital-diy.com/forum/classes/scripts/select_expand_bbcodes.js
Line: 197

The开发者_StackOverflow mod that uses this script is called "Syntax Highlighter 1.0.15". The developer is not sure why the error occurs, hopefully someone at stackoverflow can lend a hand?

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Track down the SXBB object or array and view the id variable.

Make sure that property (what id refers to) is set on that object (SXBB).

My guess is it isn't, and it's undefined, and undefined has no resize() method.