Hi Americo,

>That's because your firstN is a text node with white spaces before the
>number, some xsl processors pass those as string instead of number
>A tweak would be to use <xsl:with-param name="firstN"
>select="number($firstN)"/> to force it to be a number
>	<xsl:with-param name="firstN"
>		select="number($firstN)"/>


thank you for the quick response. I have made the changes but i'm still
getting the same problem.
'first' does not have a value and 'difference' is NaN. Any idea why?

Kind regards.
marsha




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