R help - Jun 2010 - studentized residues from nls()

Hi, I am wondering if there is a way to extract studentized residues from a
nls() object? I searched archive, someone posted a similar question before
(http://tolstoy.newcastle.edu.au/R/e6/help/09/04/10845.html), but didn't get
an answer.

Thanks for any suggestions,

John