variable and arithmetrics

Hi!

I've been trying to figure out how to assign  av variable an arithmetic 
value.
What I want to do is something like this (in pseudo code)

<xsl:variable name="priceInCents">
   <xsl:value-of select="//thing/@priceInEuro" />*100
</xsl:variable>           

Thanks.

--
Andreas Andersson
IT Dept.
Travelstart Nordic
andreas(_at_)travelstart(_dot_)se
http://www.travelstart.se