alternar color de fondo de una tabla

[urjose]

Yo use esto:

Código PHP:

  <? 
        $counter=0;                    while($row = $rs->obtenerArray()) 
                            {  
                                  if($counter%2==0) 
                                  { 
                                        $color="#FFFFFF"; 
                                  } 
                                  else 
                                  { 
                                        $color="#F0F0F0"; 
                                  } 
?> 
// muestro los td o tr con bgcolor="<?echo $color;?>" 
              <? 
              $counter+=1; 
            }  
                            ?>   

Saludos