it's a simple thing to do actually, here's an example of inserting the 'username' field into a dropdown from a table called users
$query = mysql_query("SELECT * FROM users");
echo "<select name='user'>"; // Begin dropdown box //
while($row = mysql_fetch_array($query)){
echo "<option>$row[username]</option>"; // Loop that puts info into dropdown box //
}
echo "</select>"; // End Dropdown menu //
hope that helps
