ขอสอบถามเพิ่มเติมจากบทความ javascirpt action multi form ครับ

<?PHP
if(isset($_POST["submit"]))
    {
    }
?>

<script language="javascript">
function doajax1(mydata){
 var ajax1=createAjax(); 
 ajax1.onreadystatechange=function(){
  if(ajax1.readyState==4 && ajax1.status==200){
   document.getElementById('myplace').innerHTML=ajax1.responseText;
  }else{
   return false;
  }
 }
 ajax1.open("POST","test_1.php",true);
 ajax1.setRequestHeader("Content-Type", "application/x-www-form-urlencoded"); 
 ajax1.send("register="+document.form1.register.value+"&nld="+document.form1.nld.value);
}
</script>

<script language="javascript">
function doajax2(mydata){
 var ajax1=createAjax(); 
 ajax1.onreadystatechange=function(){
  if(ajax1.readyState==4 && ajax1.status==200){
   document.getElementById('myplace').innerHTML=ajax1.responseText;
  }else{
   return false;
  }
 }
 ajax1.open("POST","test_2.php",true);
 ajax1.setRequestHeader("Content-Type", "application/x-www-form-urlencoded"); 
 ajax1.send("register2="+document.form1.register2.value+"&nld2="+document.form1.nld2.value);
}
</script>