repeaters & alternate row colours

[Gunter D'Hondt]

In my form template I'd like to have alternate colours on the repeater 
rows so that the output is something like 
<tr id="row1">...</tr>
<tr id="row2">...</tr>
<tr id="row1">...</tr>
...

does anybody have an idea how I can do this? below the snippet of my form 
template


                                <wt:repeater-size id="options" />
                                <table>
                                        <wt:repeater-widget id="options">
                                                <tr>
                                                        <td><wt:widget 
id="description"/></td>
                                                </tr>
                                        </wt:repeater-widget>
                                </table>

is there a method of retrieving the repeater row-id?


thanks in advance,
Gunter


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