[jQuery] issue with clone function.

[jQuery] issue with clone function.

Hi,
I am about to develop some pages using the clone plugin as described
http://john.jquery.com/jquery/test/clone.html but I am getting errors
when I click the add row button.
Here is the firebug error list
a has no properties
jquery-svn.js (line 1633)
anonymousjquery-svn.js (line 1633)
anonymousclone.html (line 12)
anonymousclone.html (line 19)
anonymousjquery-svn.js (line 1741)
Also how do I get to the previous row after you find the last row with
$("#source tr:last")
Thanks.
Gordon.
BTW is this going to be included in jquery, or is it not going to be.
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