xsl:variable

Is it possible to set a variable and use it to grab data from another xml
file?

Here's what I attempted with much failure-

 <xsl:template match="/">
<xsl:variable name="expert1id"
select="sco/core/expert/expert1/id"></xsl:variable>

then.....



<script language="JavaScript">

var expert1layer="<xsl:apply-templates
select="document(/sco/loadexperts/$expert1id/text" />";



</script>

</head>


Thanks-
Jennifer















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