如何正确检查输入的值

我做了一个小测验但我还有最后一个问题当单击next按钮时，它会检查该值是否未找到。如果为真，它会检查客户端选择的无线电是否等于配偶的正确答案a var correctAnswer得到+1。问题是，在第一个问题上，它是有效的(检查客户是否真的从答案中选择了一些东西，并检查它是否正确)。但当下一个问题出现时，它就不起作用了。我试图弄清楚，但没有解决方案……也可以查看jsfiddle: http://jsfiddle.net/boazmier/ru8Qj/1/我试过把checkClientChoice函数放入loadquestion函数，它没有工作，以及

var allQuestions = {
    question: {
        question0: {
            question: "Who is the first Prime Minister of Israel?",
            choices: ["David", "Rabin", "Peres", "Bibi"],
            correct: "David"
        },
        question1: {
            question: "What Is israel date of birth?",
            choices: ["1948", "1958", "1950", "1944"],
            correct: "1948"
        },
        question2: {
            question: "What is PhoneGap framework for?",
            choices: ["apache", "apps", "server", "client"],
            correct: "apps"
        }
    },
    correctAnswer: 0
};
var allquestion = allQuestions["question"];
var calcAnswers =allQuestions["correctAnswer"];
var qNum = 0;
var value;
//function that deploies the question and the choices to the section.
function loadquestions(qNum){
    $(".question").text(allquestion["question"+qNum]["question"]); //set the the question to the title
    for(var i=0;i<allquestion["question"+qNum]["choices"].length;){
        //loops throughout the li's
        var cH =(allquestion["question"+qNum]["choices"][i]); // a var that holds text of choice in poistion i
        $("label[for=li"+i+"]").text(cH); //define for every label its text
        $("#li"+i).attr("value",cH); //define for every input radio its value which is equals to label which is equals to var cH
        i++;//count i with +1
    }
}
//function that fires when clicked the "next" button and when trigered hides the current question and presents the next one
function checkClientChoice(){
 $("#next").click(function(){
     value = $("input[type='radio']:checked").val();
     if(value == undefined){
        alert("Please choose a valid answer");
    }
    else {
        if(allquestion["question0"]["correct"] == value){
            alert("correct");
            calcAnswers++;
            alert(calcAnswers);
            qNum++;
            loadquestions(qNum);
        }
         else{
            qNum++;
            loadquestions(qNum);
        }
    }
});
};
$(document).ready(function(){
    loadquestions(qNum);
    checkClientChoice();
});