Código PHP:
## Script Para seleccionar Por defecto una opcion del select
## ------------------------------------------------------------------------------------------------
$pais[0] = "Colom";
$pais[1] = "Peru";
$pais[2] = "Mex";
$sel = "Colom";
echo "<select>";
foreach($pais as $rows => $field)
echo ($field == $sel )?"<option value=\"$field\" selected=\"selected\">$field</option>":"<option value=\"$field\">$field</option>";
echo "</select>";
## ----------------------------------------------------------------------------------------------------------------------------------