strange problem displaying from db

[Anon]

$result1 = mysql_query("SELECT DISTINCT country FROM countries ORDER BY country",$db);

$myrow1 = mysql_fetch_array($result1);

<form action="results.php" method="post" target="content">
<select name="countries">
<?php
if ($myrow1 = mysql_fetch_array($result1)) {
do {
echo("<option value='");
printf($myrow1['isla']);
echo("'>");
printf($myrow1['isla']);
echo("</option>");
}
while ($myrow1 = mysql_fetch_array($result1));
echo("</select>");
}else {

  // No hay Islas
  	echo(" ");
}
?>
<input type="submit" value="IR">
</form>

[dar-k]

$result1 = mysql_query("SELECT DISTINCT country FROM countries ORDER BY country",$db);

$myrow1 = mysql_fetch_array($result1);

<form action="results.php" method="post" target="content">
<select name="countries">
<?php
if (!$myrow1 = mysql_fetch_array($result1)) {
echo(); // No hay Islas
} else {
while ($myrow1 = mysql_fetch_array($result1))
echo("<option value='");
printf($myrow1['isla']);
echo("'>");
printf($myrow1['isla']);
echo("</option>");
}
}
echo("</select>");

?>
<input type="submit" value="IR">
</form>