Firefox 2.0.0.6 document() restriction

I have a problem with the restriction on the document() function loading 
a web document which is a background image:

Security Error: Content at 
file://localhost/Users/sroe/Desktop/test/JiveXML_3025_00003.xml may not 
load data from http://sroe.home.cern.ch/sroe/svg/ffGeometry.svg.

I open a local file which has an associated XSLT stylesheet in the same 
directory. This stylesheet attempts to  load elements of an SVG file 
which is on the web, if it doesnt find the SVG file locally.

Here are some relative code snippets from the xslt (at top, global 
level):

 <!-- geometry svg file name -->
  <xsl:variable name="localFile" select="'ffGeometry.svg'"/>
  <xsl:variable name="webFile" 
select="'http://sroe.home.cern.ch/sroe/svg/ffGeometry.svg'"/>
   <xsl:variable name="localWebFile" select="'../svg/ffGeometry.svg'"/>
.
.
.
.
.

<xsl:variable name="geoFile">
 <xsl:choose>
    <xsl:when test="count(document($localFile)/*) != 0">
      <xsl:message>Local geometry file found, using this.</xsl:message>
    <xsl:value-of select="$localFile"/>
    </xsl:when>
   <xsl:otherwise>
     <xsl:choose>
       <xsl:when test="count(document($localWebFile)/*) != 0">
      <xsl:message>Local hosted geometry file found, using 
this.</xsl:message>
    <xsl:value-of select="$localWebFile"/>
         </xsl:when>
     <xsl:when test="count(document($webFile)/*) !=0">
       <xsl:message>Using the geometry file at 
http://sroe.home.cern.ch/sroe/svg/geometry.svg</xsl:message>
     <xsl:value-of select="$webFile"/>
     </xsl:when>
       <xsl:otherwise>
       <xsl:message>Your XSLT processor could not open the geometry 
file; try downloading it locally
         from 
http://sroe.home.cern.ch/sroe/svg/geometry.svg</xsl:message>
         <xsl:value-of select="''"/>
       </xsl:otherwise>
     </xsl:choose>
   </xsl:otherwise>
</xsl:choose>
  </xsl:variable>

Can anyone see a way around this? I want the stylesheet to load the 
background SVG graphic from the web, when it doesnt exist in the same 
directory.


Should I use import / include and wrap the svg in an xslt itself? (I 
generate the SVG content in a seprate step) or am I forced to put the 
svg content directly in my xslt (cut 'n' paste) and therefore make the 
xslt much heavier?

cheers

shaun