unction mod10_check(val){

    var nondigits = new RegExp(/[^0-9]+/g);

    var number = val.replace(nondigits,'');

    var pos, digit, i, sub_total, sum = 0;

    var strlen = number.length;

    if(strlen < 13){ return false; }

    for(i=0;i<strlen;i++){

        pos = strlen - i;

        digit = parseInt(number.substring(pos - 1, pos));

        if(i % 2 == 1){

            sub_total = digit * 2;

            if(sub_total > 9){

                sub_total = 1 + (sub_total - 10);

            }

        } else {

            sub_total = digit;

        }

        sum += sub_total;

    }

    if(sum > 0 && sum % 10 == 0){

        return true;

    }

    return false;

}