two newbie questions (about conditional processing)

[Yue Wang <yuleopen@gmail.com>]

Hi,

I have a new book to design, but I don't know how to do page/content
conditional processing). Please help me:)

- I want my chapter page (first page of each chapter) to be really
distinctive. that is, I define a dark color background, and want all
the text on the first page set in white. how can I do that? for
example
\chapter{hello}
\dorecurse{10}{\input zapf } % all the characters in the first page
should white, others should set in black.

- I want to insert graphics and images. all the graphics are inserted
using \placeexternalfigures. I want all the pages where the insertion
happens to be quite distictive (that is, have a very narrow text
layout, and leave the large margin for the figures. However, when a
page starts, TeX does not know wheter or not an external figure will
be placed on this page, so it really has no idea whether this page
should be set narrower or not..... how can I do that?

Thanks.

Yue Wang
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