No to display the values which are already existing

This is my xml

<Store>
 <Title>
       <Author>Steve</Author>
       <Name>XSL</Name>
 </Title>
 <Title>
       <Author>Steve</Author>
       <Name>XML</Name>
 </Title>
 <Title>
       <Author>Dan</Author>
       <Name>HTML</Name>
 </Title>
 <Title>
       <Author>Dan</Author>
       <Name>XSL</Name>
 </Title>
</Book>

I want to display the above xml as a html table with two columns Author and 
Titlle. My task is to display the Author's name only once. The output should 
be like this
Author      Title

Steve        XSL
               XML
Dan           HTML
               XSL

I am trying to use preceding-sibling axis to acheive this. But I am unable 
to get the results as I wanted.
Thanks,
Jay

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