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Drop Down Menu For Selecting Country Then States

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I want a to create a drop down menu which generates another drop down menu on the base of selected value Just for example if select United States from the 1st drop down then 2nd dr

Solution 1: 

<!DOCTYPE html>
<html>
<head>
    <title></title>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <script type="text/javascript">
        var citiesByState = {
            USA: ["NY","NJ"],
            Singapore: ["taas","naas"]
        }
        function makeSubmenu(value) {
            if(value.length==0) document.getElementById("citySelect").innerHTML = "<option></option>";
            else {
                var citiesOptions = "";
                for(cityId in citiesByState[value]) {
                    citiesOptions+="<option>"+citiesByState[value][cityId]+"</option>";
                }
                document.getElementById("citySelect").innerHTML = citiesOptions;
            }
        }
        function displaySelected() {
            var country = document.getElementById("countrySelect").value;
            var city = document.getElementById("citySelect").value;
            alert(country+"\n"+city);
        }
        function resetSelection() {
            document.getElementById("countrySelect").selectedIndex = 0;
            document.getElementById("citySelect").selectedIndex = 0;
        }
    </script>
</head>
<body onload="resetSelection()">
    <select id="countrySelect" size="1" onchange="makeSubmenu(this.value)">
        <option></option>
        <option>USA</option>
        <option>Singapore</option>
    </select>
    <select id="citySelect" size="1">
        <option></option>
    </select>
    <button onclick="displaySelected()">show selected</button>
</body>
</html>

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