Include php

eu fiz assim:

<?php
echo "<form name='form1'>"
echo "<select name='menu1' onChange='MM_jumpMenu('parent',this,0)'>"
echo "<option value='' selected>Subcategoria</option>"

include "conexao.php";
if(isset($_GET['cat']))
{ $cat=$_GET['cat']; }
$selsubs=mysql_query("SELECT DISTINCT subcat FROM produtos WHERE cat='$cat'");
$numsub=mysql_num_rows($selsubs);
echo "<select name='subcategoria'>";

while($subs=mysql_fetch_array($selsubs)) {

echo "<option value=$subs[subcat]>$subs[subcat]</option>";
// <option value='valor da opcao'>O que vai aparecer no combo para o usuario</option>
}
echo"</select>";

?>
</form>

Está errado?