Page Layout ⇒ final word on headers

[thranduil]

hi all,

i was reading a lot of editing headers in the document, and nowhere I could find, real and usefull explanation. Since I am not so much experienced in latex, i hope somebody could help me understand this:

what is practical mean of this:

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\renewcommand{\chaptermark}[1]{%
\markright{#1}{}}

after this \chaptermark is kind of empty string.
i was trying to understand this fancyhdr so i started with experiments. I put simply:

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\lhead{\chaptername \ \thechapter}

and I got for example: Chapter 1

nex i tried:

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\lhead{\chaptername \ \thechapter \chaptermark}

and I got the same: Chapter 1

I also tried:
\markright{njnjnjnjnj} and nothings happen on the page?

Please help me

[thranduil]

There is also another problem. I am using Thesis template, which you have maybe seen already. Initialy that template was intended for oneSide printing, but I wanter to make it twoSide.

I changed in the documentclass from oneSide to twoSide, and then margines changed as it should be. But the problem was changing headers. Origialy, at the very begining of the document, there is written:

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\rhead{\thepage} % Sets the right side header to show the page number

I have changed this into:

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\fancyhead[RO,LE]{\thepage} % Clears all page headers and footers

Which solved page numbers well, but the problem was with chapter names.
In the original template, at the begining of every chaper I had to write:

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\lhead{Poglavlje \thechapter.\ \emph{Chapter name}}

but when I change this into:

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\fancyhead[LO, RE]{blah blah}

Header positions are correct, but the style isn't. I suppose the style of the chapter names and page numbers in the header is hidden in this lines of .cls file:

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\lhead[\rm\thepage]{\fancyplain{}{\sl{\rightmark}}}
\rhead[\fancyplain{}{\sl{\leftmark}}]{\rm\thepage}

I hope somebody can explain me these two lines, and help me make

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\fancyhead[LO, RE]{blah blah}

has the same style like \rhead.

Many thanks