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I think it's possible from doing a bit of research but I've not found anything that fits the bill exactly. Forum code is output like this: <pre class="prettyprint lang-autoit ipsCode"> stuff </pre>The two constant classes are prettyprint and ipsCode. After prettify has run the 'prettyprinted' class is also added. I need a javascript that can cycle though the <pre> tags on a page and if they contain more than 50 lines then wrap them with some additional html something like this (the old geshi code is used as an example) <div class='geshitop'> <button onclick='geshiExpand(this);'>expand</button> <button onclick='geshiCollapse(this)' style='display: none'>collapse</button> <button onclick='geshiPopup(this)'>popup</button> </div> <div class='autoit-code-container'> <pre class="......"> </pre> </div>Prettify runs after page load so anything this code does needs to cope with that. I'm not sure if that's possible - maybe I could modify the prettify source to call a function at the end. Also the pre tag and content will be being rewritten so we need make sure we go last. I can't control when prettify runs - it's buried in the forum.