getting previous row's field.

[macaroni]

How do I go about getting the value of a field from the previous row from which my XSLT for loop is currently on.

I need a way to get the value of a field 'category' from the previous row to compare to the current value

of the field 'category'

Below is my sample code:

<xsl:for-each select="/filemaker:FMPDSORESULT/filemaker:ROW">

<xsl:variable name="category"><xsl:value-of select="filemaker:category" /></xsl:variable>

</xsl:for-each>

Any ideas/suggestions would be appreciated....

Thanks.