XSLT passing url to asp page that does not de-escape & to &, what to do?

I have a problem, I have a URL provided from a website in the form:

http://data.dezrez.com/PictureResizer.ASP?PropertyID=99999999&PhotoID=1&AgentID=9999&BranchID=9999&width=750&rotation=0

i am then using in an XSL-FO file which is using the return code

<fo:external-graphic movie="auto" clip="auto" content-height="141mm" 
content-width="188mm" content-y="0mm" content-x="0mm" 
src="http://data.dezrez.com/PictureResizer.ASP?PropertyID=99999999&amp;PhotoID=1&amp;AgentID=9999&amp;BranchID=9999&amp;width=750&amp;rotation=0" 
width="188mm" height="113mm" scaling-method="resample-any-method"/>

however the ASP pa开发者_开发百科ge at dezrez is not recognising the url as it cannot understand the & and escape it to &, I have not access to their ASP page and need to know how to approach it so that it will work.

There doesnt seem to be an XSL way to do this, so I had to write a simple servlet which de-escapes the url, calls the url, saves the returned image as a temp file and returns the aved file url to the calling process as an xml snippet

<xsl:variable name="mainpicurl"><xsl:text>http://www.xxxxxxx.co.uk/ImageProcessor/test?url=</xsl:text><xsl:value-of select="descendant-or-self::*[@id='large']/@src"/></xsl:variable>
                    <xsl:variable name="mainpic" select="document($mainpicurl)"/><fo:block>
                    <xsl:variable name="mainpic" select="document($mainpicurl)"/><fo:block>
                    <xsl:call-template name="crop-scale-image">
                        <xsl:with-param name="content-width">188</xsl:with-param>
                        <xsl:with-param name="content-height">113</xsl:with-param>
                        <xsl:with-param name="imgurl"><xsl:value-of select="$mainpic"/></xsl:with-param>
                    </xsl:call-template>