Table Row Background Image

I want to give a bg image to a table row. And I am trying the below
mentioned string. But the image is not appearing in the row.

<fo:table-row background-image="string($BrochureCommonImages)notes_bg.jpg"
keep-with-next="always">




For any other images in the pdf, I am writing a code something like this
below which is working fine

<fo:block>
	
<fo:external-graphic content-height="1.27cm" content-width="7.51cm">
	
<xsl:attribute name="src">
	
<xsl:value-of select="string($BrochureCommonImages)" />notes_bottom.jpg
	
</xsl:attribute>
	
</fo:external-graphic>

</fo:block>