<xsl:copy-of select="document(<!--#include
file="JScripts/Buttons.js"-->)" / >

<!-- --> is a comment, so the above is equivalent to

<xsl:copy-of select="document()" / >

which is a syntax error.

If you know wher ethe #include finds its file you could do

<xsl:value-of select="document('some/path/JScripts/Buttons.xml')"/>

but note that you need to have an xml version of the .js file
which can be as simple as

<x><![CDATA[
... javascript code
]]>
</x>


David

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