<xsl:value-of disable-output-escaping="yes" select="count(bannerlist/banner)" /> 
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

it's almost always a mistake to use disable-output-escaping unless you
really know you need it (as it is non-portable and a hack) here you
certainly do not need it as count() only ever produces digits and
disable-output-escaping does not affect digits it only affects the way <
and & appear.

<xsl:for-each select="bannerlist/banner"> 
    <xsl:param name="count" expr="count+1"></xsl:param> 

<xsl:param can only appear as the first child of xsl:template
or xsl:stylesheet. Also it does not have an expr attribute.

It looks from the expr attribute that you are trying to add one to the
value of a counter, but recall that you can not change the value of a
parameter once it is bound.

David

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