$color1 = "bdbdbd";
$color2 = "d3d3d3";
$active_color = $color1;

{
 if ($_loop % 5 == 0)
 {
  if ($active_color eq $color1)
  {
   $active_color=$color2;
  } else
  {
   $active_color=$color2;
  }
 }
 out "<tr valign='middle' bgcolor='$active_color'>";
}