Alternando colores de filas

[aliza]

Te pongo un ejemplo mío que funciona.

<table style="border:1px solid #FF0000; color:#000099;">

<tr style="background-color:red; font-weight: bold;">
<td>Pedido</td>
<td>Tipo</td>
<td>Asesor</td>
<td>Fecha/Hora</td>
<td>Matr&iacutecula</td>
<td>Referencia</td>
<td>Denominaci&oacuten</td>
<td>Unidades</td>
<td>Coste</td>
<td>F.Pedido</td>
<td>F.Prevista</td>
<td>F.LLegada</td>
<td>Entregada</td>
<td>Instalada</td>
<td>Estado</td>
</tr>

<?php
$lista_colores=array('Aquamarine' ,'Turquoise');
$num_colores=2;
$indice=0;
while($row = mysql_fetch_array($sql)){
$color=$lista_colores[$indice % $num_colores];
$indice++;
echo "<tr bgcolor=$color>";
echo "<td>".$row['npedido']."</td>";
echo "<td>".$row['tipo']."</td>";
echo "<td>".$row['user']."</td>";
echo "<td>".$row['fechahora']."</td>";
echo "<td>".$row['matricula']."</td>";
echo "<td>".$row['referencia']."</td>";
echo "<td>".$row['denominacion']."</td>";
echo "<td>".$row['unidades']."</td>";
echo "<td>".$row['pvp']."</td>";
echo "<td>".$row['fpedido']."</td>";
echo "<td>".$row['fprevista']."</td>";
echo "<td>".$row['fllegada']."</td>";
echo "<td>".$row['entregada']."</td>";
echo "<td>".$row['instalada']."</td>";
echo "<td>".$row['estado']."</td>";
echo "</tr>";
}
?>
</table>