syntax question: using a variable inside format-number()

When I use the following line in my stylesheet:
<xsl:value-of select="format-number(/AssetAnalyzer/cash,'#00%')"/>

It returns a nice percentage. However, I have several Asset categories so a
variable ($curcat) has been set in my stylesheet to keep track of the
current category.

I tried the following:
<xsl:value-of select="format-number(/AssetAnalyzer/$curcat,'#00%')"/>

but it bombed giving a "Node Test expected" error.

What's the correct syntax to achieve what I'm trying to do?


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