Marking every second row

Hi All,

I got an very simple XSL-File wich produces following output from a very 
simple XML-File
<table>
<tr><td>aaa</td></tr>
<tr><td>bbb</td></tr>      <-- X
<tr><td>ccc</td></tr>
<tr><td>ddd</td></tr>      <-- X
<tr><td>eee</td></tr>
<tr><td>fff</td> </tr>      <-- X
</table>


Now I want the background of the lines which are marked with an X in 
another color.
So how do I select every second row of my output?

Thanks

Sorin



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