function isCreditCard( CC ){
if (CC.length > 19)
return (false);
sum = 0; mul = 1; l = CC.length;
for (i = 0; i < l; i++){
digit = CC.substring(l-i-1,l-i);
tproduct = parseInt(digit ,10)*mul;
if (tproduct >= 10)
sum += (tproduct % 10) + 1;
else
sum += tproduct;
if (mul === 1)
mul++;
else
mul–;
}
if ((sum % 10) === 0)
return (true);
else
return (false);
}
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