>What problem was it giving you?
I figured it out! Actually, what I posted wasn't exactly what I was using, I had multiple parameters in my asp call, so the tag really looked like:
<a><xsl:attribute name="href">messages.asp?action=replyform&message=<xsl:value-of select="msg"/></xsl:attribute>Reply</a>
Once I replaces the & above with & I was good to go. Shessh, XML really IS strict ;-)
