[xsl] Immediate Previous Node

["Luke Ambrogio" <gryzlaw@xxxxxxxxxxx>]

hello ppl,

i have a small problem, hope you can help.
i have a sorted xml something like:

<index>
<item>a</item>
<item>ab</item>
<item>b</item>
<item>c</item>
</index>

how can i, using xsl of course, find out the data of immediate previous 
node. example while processing:

<item>ab</item>

using <xsl:if> i want to check whether the previous one is <item>a</item> so 
that i can process it different

hope i was clear

10x in advance

Luke

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