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function random_between(to, from) { return Math.floor(Math.random() * (to - from + 1) + from); } $(document).ready(function() { var num1 = random_between(0,5) var num2 = random_between(5,10); $('label[for="captcha"]').text("What is "+num1+" + "+num2); $('form').submit(function() { if($('#captcha').val() == (num1+num2)) { $('form').submit(); } else { alert("Your CAPTCHA IS NOT valid!"); return false; } }); });