if (mysql_affected_rows($connect)<1) { <<<<---------------------------------- ???
echo "<script language=\"javascript\">";
echo "alert('Username or Password is wrong please try again.');history.go(-1);</script>";
exit;
}
=====================================================
มันมาเข้าเงื่อนไขนี้ ............... if (mysql_affected_rows($connect)<1)
ลองเปลี่ยนจาก $sql = "SELECT * FROM admin WHERE user='".$user."' AND pass='".$pass."'";
มาเป็ฯ $sql = "SELECT * FROM admin WHERE user='$user' AND pass='$pass'";