[OS X TeX] Setting different margins for different pages

[John B. Thoo]

Hi, everyone.  I'm sorry if this is a FAQ, but I had a hard time trying to find an answer in comp.text.tex.

Using \documentclass{letter}, I'd like to set the margins so that the first page is something like

\setlength\topmargin{-0.5cm}
\setlength\oddsidemargin{90pt}

to accomodate my department's letterhead paper, but then the succeeding pages simply have a 1-inch margin all around.  How can I set that in the preamble?

Thanks very much.

---John.
(I receive the digest.)

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"It is worth thinking deeply about simple things."
---Jesus De Loera, UC Davis mathematics, 12 Jan 2011