$connect_id = odbc_connect("host","user","pass");
$query = "SELECT drop-down-item FROM table";
$result = odbc_exec( $connect_id, $query );
print "<select name=foo>";
while($row = odbc_fetch_array( $result ))
{
print "<option>".$row[dop-down-item];
}
print "</select>";
odbc_close( $connect_id );