<script>function calc(str){ var coeff = [7,9,10,5,8,4,2,1,6,3,7,9,10,5,8,4,2,1]; var suffix = ['1','0','x','9','8','7','6','5','4','3','2']; var sum = 0; for(var i=0;i<17;i++) sum += coeff[i] * parseInt(str.charCodeAt(i)-48); sum %= 11; str = str.substr(0,17) + suffix[sum]; return str;}</script><body><button onclick="alert(calc(
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