<xsl:if> with JavaScript function via <msxsl:script>

I'm moving fromn v3 to v4 of MSXML, and have converted my <xsl:script>'s to
<msxsl:script>'s (with a "user" prefiex/namespace).  However, I was using
<xsl:if expr="myFunction()">, and since v4 requires the
www.w3.org/1999/XSL/Transform namespace, which apparently doesn't contain
'expr' as an attrib of <xsl:if>, I tried <xsl:if test="user:myFunction()">,
but that doesn't work either.

Has anyone used a scripting function in the evaluation of my "if", or can it
only be used in the "select" of an <xsl:value-of>?

Thanks.

Daryl

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