I keep getting dmxzone messages even though I have removed every trace I could find from my computer. But that's another problem (I think).
You could go through and comment out your scripts one at a time. Wrap your <script> tagsets in html comments...
<!-- <script src="somelocation.js"></script> -->
...if it stops working while previewing in the browser, the newly wrapped script is necessary to the page (delete the comment).
If it works fine with the commented script, delete the script tag and comment.
Recaptcha is usually associated with forms.