A doubt

Hi,
I was trying something out.But it didnt work.I was for-each ing thru a set
of nodes and displaying the child nodes.Now I have a requirement that while
displaying a particular child node i have to make some modification to it's
value.So I was writing 
<xsl:for-each blabla>
....
<xsl:value-of select="user:modify(@x)" >
...
</xsl:for-each>
But it did not work.Is calling a script function with a node not possible???
Regards,
Ratul. 


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