yin wrote:...
I know the description sounds strange
...
You're right. Try explaining that again

And some code would be useful too.
EDIT: After reading that again maybe I've understood it. What you want is this: let's say you have pages a, b, c, d. Now, you want a page without page number to come after page b, so that you have: a, b, empty, c, d. Is this it?
Try this:
Code: Select all
\documentclass{book}
\usepackage{lipsum}
\usepackage{fancyhdr}
\fancyhf{}% clears all headers/footers
\newcommand{\mainstyle}{% a new command for easy page style switch
\fancyhead[LE]{\thepage}
\fancyhead[RO]{\thepage}
\fancyhead[C]{\textit{Some header text}}
\renewcommand{\headrulewidth}{0pt}
\pagestyle{fancy}
}
\newcommand{\emptystyle}{% a new command for easy page style switch (for pages without page number)
\fancyhead[LE]{}
\fancyhead[RO]{}
\fancyhead[C]{\textit{Some header text}}
\pagestyle{fancy}
\renewcommand{\headrulewidth}{0pt}
\addtocounter{page}{-1}% setting back the counter; pay attention that this means that the page without page number will be the same "type" as the previous, i.e., if the previous is an odd page, this one will be the odd page too and vice versa; so, if you have twoside document with different inside and outside margins, this may result in unsatisfactory results
}
\begin{document}
\renewcommand{\thepage}{\alph{page}}
\mainstyle% page style for pages with header and page number
\lipsum[1-11]\newpage
\emptystyle% page style for the page with header but without page number
Test: a page with some text in header, but without page number.\par
\lipsum[1-3]\newpage
\mainstyle% page style for pages with header and page number
\renewcommand{\thepage}{\alph{page}}
\lipsum[1-11]\newpage
\emptystyle% page style for the page with header but without page number
Test: a page with some text in header, but without page number.\par
\lipsum[1-3]\newpage
\mainstyle% page style for pages with header and page number
\lipsum[1-11]
\end{document}