find previous node at the same level

Hello,

Here's how my xml looks. 

<home>
<group>group 1</group>
<item>item one</item>
<item>item two</item>
<item>item three</item>
<item>item four</item>
<group>group 2</group>
<item>item one</item>
<item>item two</item>
<item>item three</item>
</home>

<xsl:apply-templates select="item">
        if previous node is group... then do blah
        
        else if previous node is item.... then do blah
</xsl:apply-templates>

So when I am in item template how do I find what the
previous node is ? (In my example it will be the item
one nodes)

Your help will be appreciated. Thanks.

Mark

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