disable-output-escaping in text

Using Xalan with xsl:output set to:
<xsl:output method="html/>

this XSL:
<img><xsl:attribute name="src">
	<xsl:test disable-output-escaping="yes">func("v")</xsl:text>
</xsl:attribute></img>

and this XSL:
<img><xsl:attribute name="src">
	<xsl:test disable-output-escaping="no">func("v")</xsl:text>
</xsl:attribute></img>

both produces this html:
<img src="func(%22v%22)">

I need to disable escaping and generate:
<img src="func("v")">

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