adjacent category model in ordinal regression

Hi:
  I want to analyze some multinomial data. And the
response has a natural ordinal sturcture. I want to
fit a adjacent category model to the data by logit,
probit and complementary log-log link functions. I
found a package "VGAM"
(www.stat.auckland.ac.nz/~yee/VGAM/ ) whose function
"acat" can fit the adjacent category model but it only
has "log" and "identity" link functions. Does anybody
know there is a package or function can do the
analysis I want?
  Thank you!

liu

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