[jQuery] MetaData plugin - help needed

[jQuery] MetaData plugin - help needed

Hi all,
I'm having a problem with John's metadata plugin.
The value of the parameter arr in the jQuery.fn.get function in metadata.js is always undefined, so at this point:
  return arr && arr.constructor
== Array ?
it never branches towards the metadata logic, hence I can never access metadata properties.
To ascertain this I slapped a $.log(arr) immediately after the beginning of the function, but every single jquery query is spitting out undefined at this point.
What is the arr parameter, and why would mine always be undefined?
Regards,
Chris
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