ช่วยดูหน่อยค่ะ มันไม่ยอม insert ลง db งานรีบๆ แม้เรื่องง่ายๆ ก็มักมีปัญหา

<div id="add-new-user"><h2>Add New User</h2></div>
<?php 
          $r_user_name=$_POST[member_name];
          $r_user_surname=$_POST[member_sname];
          $r_user_nickname=$_POST[user_company];
          $r_user_address=$_POST[member_address];
          $r_user_mobile=$_POST[member_mobile];
          $r_user_email=$_POST[member_email];
          $r_user_user=$_POST[member_name];
          $r_user_pass=$_POST[member_pass];
	  $r_user_level=$_POST[user_level];
          $r_user_active=$_POST[admin_active];

if($op=='add_user'){
	$sql_add="insert into sb_users(user_id,name,surname,username,user_email,user_company,user_address,user_regdate,user_password,newsletter,user_gid,
	user_active,user_mobile,user_tel,user_question ,user_answer) VALUES (null, '".$r_user_name."', '".$r_user_surname."', '".$r_user_user."',''". $r_user_email.", '-', '-', '".DATEDAY."', '".$r_user_pass."', '1', '".$r_user_level."', '".$r_user_active."', '".$r_user_mobile."', '-', '-', '-')";        
    
		if($q= mysql_query($sql_add)){
              echo "
                  <script language='javascript'>
                      alert('ระบบได้ทำการบันทึกข้อมูลเรียบร้อยแล้ว');
                      window.location.href='link.php?name=admin';
                  </script>
              ";
          }else{
			  echo "
                  <script language='javascript'>
                      alert('".$op."');
                      window.location.href='link.php?name=admin';
                  </script>
              ";  
			  
			  }
}
        ?>
        
            <form name="frm-regis" id="frm-regis" method="post" action="" enctype="text/plain">
          
            <div>
            <label> Name : </label>
            <input name="member_name" type="text" class="required" id="adm_member_name" maxlength="150" />
            </div>
            <div class="clear">
            <label>Surname : </label>
            <input name="member_sname" type="text" class="required" id="member_sname" maxlength="150" />
            </div>
           
            <div class="clear">
            <label>Mobile:</label>
            <input name="member_mobile" type="text" id="member_mobile" /><span id="text-alert">08x-xxx-xxxx</span>
            </div>
            
            <div class="clear">
            <label>Email:</label>
            <input name="member_email" type="text" class="required email" id="member_email" /><span id="text-alert">[email protected]</span>
            </div>
         
            <div style="margin:20px 0px 20px 0px;"> 
            <label> User levels : </label>
            <input type="radio" name="user_level" value="3" checked>&nbsp;(Employee)&nbsp;พนักงาน&nbsp;&nbsp;
            <input type="radio" name="user_level" value="4">&nbsp;(MD,President)&nbsp;ผู้บริหาร
            </div>
            
            <div style="margin:20px 0px 20px 0px;"> 
            <label>Administrator : </label>
            <input type="radio" name="admin_active" value="0" checked>&nbsp;No&nbsp;&nbsp;&nbsp;&nbsp;
            <input type="radio" name="admin_active" value="1">&nbsp;Yes &nbsp;&nbsp;
            <span id="text-alert">ต้องการให้สมาชิกเป็นผู้ดูแลระบบหรือไม่ ?</span>
            </div>
        
            <div style="margin:20px 0px 20px 0px;" class="clear"> 
             <label>Username : </label>
             <input name="member_user" type="text" class="required" id="adm_member_user" disabled /><span id="text-alert">(Auto) ใช้สำหรับ login</span>
             </div>
             
             <div class="clear">
             <label>Temporary password:</label>
             <input name="member_pass" type="password" id="member_pass" class="required"  minlength="4" value=""/><span id="text-alert">พาสเวิร์ดชั่วคราว</span>
             </div>
        
            <div align="center" style="margin:20px 10px 20px 0px;">
            <input name="op" type="hidden" value="add_user" />
            <input name="Submit" type="submit" value="Submit" />

            <input name="Submit" type="reset" value="Clear" />
            </div>
            </form>
        <br/>
        <br/>