Problem using xsl:if to skip a node in a repeating area

I'm trying to use XSL to render an RSS feed in such a way as to skip  
items whose titles start with the text "ADV". But, admittedly, I'm an  
XPath noob, and the code is not working.
I'm using the following, within <xsl:template>:

<xsl:variable name='adstring' select='ADV' />
<xsl:variable name='checkti' select='{title}' />
<xsl:if test="not(starts-with($checkti,$adstring))">
<li><a href='{link}'><xsl:value-of select="title"/></a></li>
</xsl:if>


I get an error that says the xsl is not a valid xslt doc, with an  
"InnerException" (I'm using the .NET XSLT component and C# to do the  
transformation).
Help?



Sean Gallagher

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