รบกวนหน่อยค่ะ หนูทำแบบฟอร์มกรอกข้อมูลไว้ 6 เพจค่ะ โดยในแต่ะละเพจจะมีปุ่มย้อนกลับ และปุ่มหน้าถัดไป

<?php

		 if($submit=="หน้าถัดไป"  && $_POST['Id'] != null  )
				 {
		   $select="select * from activitiesdata  where Id= ".$_POST['Id'];
		   $se_result=mysql_query($select);
		   if($se_result){
		  
		  if($_POST['ActivitiesOther'] !=""){
		foreach($_POST['ActivitiesOther'] as $key=>$value){
		$sql="update activitiesdata set ActivitiesId = '".$value."',Other = '".$_POST["Theother"] ."' where Id = '".$_POST["Id"]."' ";
        $result=mysql_query($sql);
		}
		}
   
     foreach($_POST['Activities'] as $key => $value){
				$sql = "update activitiesdata set ActivitiesId = '".$value."' where Id ='".$_POST["Id"]."'";
				$result = mysql_query($sql);

	  }
		              
		

		   else 

			   
		if($_POST['ActivitiesOther'] !=""){
		foreach($_POST['ActivitiesOther'] as $key=>$value){
		$sql="insert into activitiesdata(Id,ActivitiesId,Other) values('".$_POST["Id"]."','".$value."','".$_POST["Theother"] ."')";
        $result=mysql_query($sql);
		}
		}
   
     foreach($_POST['Activities'] as $key => $value){
				$sql = "insert into activitiesdata (Id, ActivitiesId) values('".$_POST["Id"]."','".$value."')";
				$result = mysql_query($sql);

	  }
		
		
		  }
 
  
   				
?>