I just can't figure out the syntax here

I'm passing a directory location into Saxon as a parameter. Only I need to make every '\' character in the (windows) directory path a '\\' for the uri in the transform. As it's only the transform that needs this I thought I'd do the conversion in the transform. And it's beaten me.

The command line param is: ...path="C:\Documents and Settings\Adminis
trator\My Documents\Projects\Transform\OutputFiles"

I've got this neatly passed into the transform with:

<xsl:param name="path"></xsl:param>
...
<xsl:template match="Log">
         <xsl:value-of select= replace($path, '\\', '\\')" />

         <xsl:variable name="Command" select="concat($path, '\\OutputFiles\\Command-output.xml')" />
         <xsl:result-document method="xml" href="{$Command}">
         .....

But fails and I just can't figure out how to achieve setting the result-document