child node using variable

["xsl list" <xsl_list@xxxxxxxxxxx>]

<father>
	<older_son>Bob</older_son>
	<younger_son>Peter</younger_son>
</father>

I want to be able to deal with a child of the node "father" on the fly 
(using a variable), some thing like:
<xsl:variable name="son" select="'older_son'"/>
<xsl:value-of select="father/{$son}"/>

Can I do that?
________________________________________________________________________
Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com


XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list