R help - Jun 2014 - multcomp: Contrasts for Tukey

I want to use the glht function.

In the linfct argument, I provide my linear functions to be tested.
I provide contrasts there, such as (for example)
c("Group1 - Group2 = 0", "Group1 - Group3 = 0")
to compare group no 1 against the other groups.

I want to do Tukey's test in this fashion. Is it possible? I saw I could do
(for example)
mcp(Group='Tukey')
for this, but this does all the pairwise comparisons and I want only
specific contrasts.
If not, how can I do it?

Thanks

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