You have a typo in your instructions in the word legacy in postbit_legacy
Also in the stuff below I notice it is wrapped in the header. Does you code also go inside the <head> </head> part or does it go outside this? The comment below suggests it goes inside these tags
in SHOWTHREAD:
find:
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<script type="text/javascript" src="clientscript/vbulletin_post_loader.js?v=$vboptions[simpleversion]"></script>
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AFTER place this:
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<!-- Start Post Thank You Hack -->
<script type="text/javascript" src="clientscript/post_thanks.js"></script>
<!-- End Post Thank You Hack -->
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