Prefiero trabajarlo asi:
Código PHP:
<?
$conectar=mysql_connect("localhost","root","");
$db="cutec";
$sql = mysql_query("SELECT curso FROM curso ORDER BY idcurso");
?>
<? if (mysql_num_rows($sql) > 0) { ?>
<select name="select" id="select">
<? while ($temp = mysql_fetch_array($sql)) { ?>
<option value="<? echo $temp["idcurso"]; ?>"><? echo $temp["curso"]; ?></option>
<? } mysql_free_result($sql);?>
</select>
<? }else{ ?>
No hay datos
<? } ?>