importing text-source in a xsl-stylesheet

Hi,

I have tho following problem:

I'm using several xsl-stylesheets for generating html-output. Every html-page corresponds to one
xsl source file. Now I want to include a certain header (lika a javascript-block) in each of them (lets call it header.xsl).
There are no xsl-Tags in that haeder-file.
I tried it with the <xsl:import> and the <xsl:include> tags but none of them seem to work my way.
What am I doing wrong ?

the code snipplet would look like this:

file: header.xls:
<JAVASCRIPT> ....something... <JAVASCRIPT>


file: htmlpage.xls
<xsl:stylesheet
   xmlns:xsl="http://www.w3.org/XSL/Transform/1.0"
   xmlns="http://www.w3.org/TR/REC-html40"
   result-ns=""
>

<xsl:include hfref="haeder.xsl"/>

...something...

</xsl:stylesheet>

regards 
toby


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