DOCBOOK: Working with Navigation & Graphics

I am using chunk.xsl with Docbook 4.1.2

How do I go about creating custom navigation buttons (graphics) for the Prev
& Next links.

Many thanks

Ken

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Ken Walton

Digital Design Development
www.ddd.co.za
Tel: 011 8862299
Fax: 011 7813498
Mobile: 082 5787937