variable value in "select" attribute

I need to insert a variable value in the middle of a "select" string.  I
have variables $day1date, $day2date, etc...and I am passing a parameter $n
to a template to define the numeric portion of the variable name.  I want to
be able to fill in the numeric value on the fly like this:

<xsl:value-of select="\$day$ndate"/>

I know the syntax is wrong.  I need "$day" to be treated as a string, $n to
be treated as a number, and "date" to be treated as a string.  I cannot use
the concat() function, because <xsl:value-of
select="concat('$day',$n,'date')/> simply returns "$day1date".  I need it to
return the VALUE of $day1date.

Any ideas?

Thanks,

Brian

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