$resultMainMenu = mysql_query("SELECT * FROM tblmenu WHERE parentid=0 ORDER BY menuname ASC") or die(mysql_error());
while($row = mysql_fetch_array($resultMainMenu)){
echo $row['menutitle'] . '<br />'; // echo main menu
$resultSubmenu = mysql_query("SELECT * FROM tblmenu WHERE parentid=" . $row['id'] . " ORDER BY menuname ASC") or die(mysql_error());
if(mysql_num_rows($resultSubmenu) >= 1){
while($rowSub = mysql_fetch_array($resultSubmenu)){
echo ' -- ' . $rowSub['menutitle'] . '<br />'; // echo sub menu
}
}
}