//
// $Id$
//

function ccc13(form) {
   factor = 3;
   sum = 0;
   for (index = form.numero.value.length; index > 0; --index) {
      sum = sum + form.numero.value.substring (index-1, index) * factor;
      factor = 4 - factor;
   }

   cc = ((1000 - sum) % 10);
   form.chiffre.value = "" + form.numero.value + cc;
   result = form.chiffre.value;
   form.cc.value = cc;

   if (form.numero.value.length!=12){
      alert("Error! Please key in 12 digits")
      form.cc.value = ""
      form.chiffre.value = "";
      form.numero.focus();
   }
}

function ccc8(form) {
   factor = 3;
   sum = 0;

   for (index = form.numero.value.length; index > 0; --index) {
      sum = sum + form.numero.value.substring (index-1, index) * factor;
      factor = 4 - factor;
   }
   cc = ((1000 - sum) % 10);
   form.chiffre.value = "" + form.numero.value + cc;
   result = form.chiffre.value;
   form.cc.value = cc

   len = form.numero.value.length;
   if ( len != 7){
      alert("Error! Please key in 7 digits : " + len)
      form.cc.value = ""
      form.chiffre.value = "";
      form.numero.focus();
   }
}


function ccc12(form) {
   factor = 3;
   sum = 0;
   for (index = form.numero.value.length; index > 0; --index) {
      sum = sum + form.numero.value.substring (index-1, index) * factor;
      factor = 4 - factor;
   }

   cc = ((1000 - sum) % 10);
   form.chiffre.value = "" + form.numero.value + cc;
   result = form.chiffre.value;
   form.cc.value = cc

   if (form.numero.value.length!=11){
      alert("Error! Please key in 11 digits")
      form.cc.value = ""
      form.chiffre.value = "";
      form.numero.focus();
   }
}


function ccc14(form) {
   factor = 3;
   sum = 0;

   for (index = form.numero.value.length; index > 0; --index) {
      sum = sum + form.numero.value.substring (index-1, index) * factor;
      factor = 4 - factor;
   }

   cc = ((1000 - sum) % 10);
   form.chiffre.value = form.numero.value + cc;
   result = form.chiffre.value;
   form.cc.value = cc

   if (form.numero.value.length!=13){
      alert("Error! Please key in 13 digits")
      form.cc.value = ""
      form.chiffre.value = "";
      form.numero.focus();
   }
}


function ccc18(form) {
   factor = 3;
   sum = 0;
   for (index = form.numero.value.length; index > 0; --index) {
      sum = sum + form.numero.value.substring (index-1, index) * factor;
      factor = 4 - factor;
   }

   cc = ((1000 - sum) % 10);
   form.cc.value = cc

   if (form.numero.value.length!=17){
      alert("Error! Please key in 17 digits")
      form.cc.value = "";
      form.numero.focus();
   }
}