You guys should really consider updating this plugin. I was looking at the how it work and it's doing some really silly things, like connecting to the database and running a query on every page the captcha is used on just to determine what version of vbulletin is being used. I modified class_humanverify_solvemedia.php so it doesn't do this.
You should also consider putting any html into a template so it is easily editable.
At the very least make separate versions for vbulletin 3 and 4 to eliminate that database connection & query.
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