function validate() {

    console.log('validate()');

    var x = Math.round(Math.random() * 10);

    var y = Math.round(Math.random() * 10);

    var answer = x+y;

    var text = "Are you a human check\nWhat is "+x+" + "+y+" equal?";

    var userAnswer = prompt(text,"");

    if (answer==userAnswer) {

        console.log("correct");

        return true;

    } else {

        console.log("not correct");

    var request = new XMLHttpRequest();

    request.open('GET', '/checkout_rejected', true);

    request.onload = function() {

            console.log("checkout_rejected status:"+this.status);

        };



        request.onerror = function() {

        // There was a connection error of some sort

            console.log("checkout_rejected onerror");

        };

    request.send();

    alert("In correct answer, please try again.");

        return false;

    }

}