function checkidSA($idnumber) {
  if ($idnumber.length==10)
  {
    if ((parseInt($idnumber.charAt(0))*2) > 9)
    {$number1 = parseInt($idnumber.charAt(0)) * 2;
     $number1 = parseInt($number1/10) + ($number1 - (parseInt($number1/10)*10));}
    else {$number1 = (parseInt($idnumber.charAt(0))*2);};
    $number2 = parseInt($idnumber.charAt(1));

    if ((parseInt($idnumber.charAt(2))*2) > 9)
    {$number3 = parseInt($idnumber.charAt(2)) * 2;
     $number3 = parseInt($number3/10) + ($number3 - (parseInt($number3/10)*10));}
    else {$number3 = (parseInt($idnumber.charAt(2))*2);};
    $number4 = parseInt($idnumber.charAt(3));

    if ((parseInt($idnumber.charAt(4))*2) > 9)
    {$number5 = parseInt($idnumber.charAt(4)) * 2;
     $number5 = parseInt($number5/10) + ($number5 - (parseInt($number5/10)*10));}
    else {$number5 = (parseInt($idnumber.charAt(4))*2);};
    $number6 = parseInt($idnumber.charAt(5));

    if ((parseInt($idnumber.charAt(6))*2) > 9)
    {$number7 = parseInt($idnumber.charAt(6)) * 2;
     $number7 = parseInt($number7/10) + ($number7 - (parseInt($number7/10)*10));}
    else {$number7 = (parseInt($idnumber.charAt(6))*2);};
    $number8 = parseInt($idnumber.charAt(7));

    if ((parseInt($idnumber.charAt(8))*2) > 9)
    {$number9 = parseInt($idnumber.charAt(8)) * 2;
     $number9 = parseInt($number9/10) + ($number9 - (parseInt($number9/10)*10));}
    else {$number9 = (parseInt($idnumber.charAt(8))*2);};

    $number10 = parseInt($idnumber.charAt(9));

    if(($number1+$number2+$number3+$number4+$number5+$number6+$number7+$number8+$number9)>9)
    {$CodeNu= $number1+$number2+$number3+$number4+$number5+$number6+$number7+$number8+$number9;
    $CodeNu = ($CodeNu - (parseInt($CodeNu/10)*10))}
    else
    {$CodeNu=$number1+$number2+$number3+$number4+$number5+$number6+$number7+$number8+$number9;}

    if($CodeNu != 0)
    {if($number10 == (10-$CodeNu)){return true;} else {return false;}}
    else
    {if($number10 == $CodeNu){return true;} else {return false;}}
  }
  else
  {return false;}

  document.writeln($idnumber);
}