multi-page floats

[Henning Hraban Ramm <hraban@fiee.net>]

Hi again,
in my current book project there are sets of full-page graphics, where  
there’s first a drawing, to be printed on transparent paper, followed  
by a water colour picture as background, i.e. a series of

right page: foreground graphic
right page: background graphic

The transparent pages are left out in pagination.
Between chapters (i.e. stories), the following macro does what I want:

\def\DoublePic#1{
	\page[right] % foreground picture on transparent paper
	
	\setuppagenumbering[state=stop]\setuppagenumber[state=stop]\par
	\resetlayer[bg]
	\setlayer[bg]{\externalfigure[#1-fore][height=\dimexpr(\paperheight 
+6mm)]}
	\setupbackgrounds[page][background=bg]
	\strut\par % page needs some content
	
	\page[right] % background picture on normal paper
	
	\setuppagenumber[state=start]\par
	\resetlayer[bg]
	\setlayer[bg]{\externalfigure[#1-back][height=\dimexpr(\paperheight 
+6mm)]}
	\setupbackgrounds[page][background=bg]
	\strut\par
	
	\page
	\setuppagenumbering[state=start]
}


Now, the publisher would like to move the picture pages in the middle  
of the stories, i.e. I need them to float "here" without manual page  
breaking.
How can I achieve that?

I’d also appreciate enhancements to my macro above.

(MkIV latest beta on OSX Intel.)

Thank you very much in advance!

Greetlings, Hraban
---
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