dynamic variable names

Hi,
  How do I construct the name of a variable
dynamically.

  I have an xsl file (test.xsl) which has an include
file.

<?xml version="1.0"?>
<xsl:stylesheet
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
version="1.0" >
<xsl:include href="../include.xsl"/>	
...
...
...

There are two variables defined in the include.xsl
file, called name1 and name2.

Now I want to use the value of these two variables
dynamically in 'test.xsl'.
I did something like, 

<xsl:value-of select="concat('name',$i)" /> where $i
will be 1 and 2 in different conditions.

but this only displays name1 and name2 instead of the
values held in them.

How do I construct the name of the variable to be
used, dynamically. Or am I missing the whole plot
here. I'm a beginner. 

Thanks for your help.

Sam.

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