[xsl] incrementing a variable

[John Moylan <john at rte dot ie>]

Hi,

I am having difficulties with the following piece of code. I wish to 
decrement the value of $NUMIMAGES on each iteration of a for-each loop. 
However instead of the desired effect, which is to create links to 
images based on the name of the page($page-name) and the number of 
images in each page. I am simply getting multiple links to the same 
image where $NUMIMAGES still has it's initial value from the count function.

I am sure that, as ever the answer is easy. Can anyone help?

<xsl:variable name="NUMIMAGES">
                                       <xsl:value-of select 
="count(/NewsML/NewsItem/NewsComponent/NewsItem/NewsComponent/NewsComponent/ContentItem/Encoding/DataContent)" 
/>
                               </xsl:variable>
                               <td><xsl:for-each select = 
'//Encoding/DataContent'>
                                       <xsl:element name="a">
                                               <xsl:attribute name="href">
                                                       <xsl:value-of 
select="$page-name"/>.<xsl:value-of 
select="$NUMIMAGES"/>.jpg</xsl:attribute><xsl:variable name="NUMIMAGES" 
value="{$NUMIMAGES - 1}"/>
                                       <b>
                                               Click here for Article!<br/>
                                       </b>
                                       </xsl:element>
                               </xsl:for-each>


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