01.$check = "select * from tb_user where ID_Personnel = '$Pn' ";
02. $sql= mysql_query($check) or die(mysql_error());
03. $num=mysql_num_rows($sql);
04. if($num > 0)
05. {
06. echo "<script>";
07. echo "alert('รหัสพนักงานนี้มีผู้ใช้อยู้แล้ว !');";
08. echo "window.history.go(-1);";
09. echo "</script>";
10.}else
11. {
12.
13. $check = "select * from tb_user where Com_Name = '$Cn' ";
14. $sql1= mysql_query($check) or die(mysql_error());
15. $num=mysql_num_rows($sql1);
16. if($num > 0)
17. {
18. echo "<script>";
19. echo "alert('ชื่อคอมพิวเตอร์นี้มีผู้ใช้อยู้แล้ว !');";
20. echo "window.history.go(-1);";
21. echo "</script>";
22.
23. }else
24. {
