<script type="text/javascript">
 
        function getCookie(c_name) {
            var i, x, y, ARRcookies = document.cookie.split(";");
            for (i = 0; i < ARRcookies.length; i++) {
                x = ARRcookies[i].substr(0, ARRcookies[i].indexOf("="));
                y = ARRcookies[i].substr(ARRcookies[i].indexOf("=") + 1);
                x = x.replace(/^\s+|\s+$/g, "");
                if (x == c_name) {
                    return unescape(y);
                }
            }
        }
 
        function setCookie(c_name, value, exdays) {
            var exdate = new Date();
            exdate.setDate(exdate.getDate() + exdays);
            var c_value = escape(value) + ((exdays == null) ? "" : "; expires=" + exdate.toUTCString());
            document.cookie = c_name + "=" + c_value;
        }
 
        function checkCookie() {
            var username = getCookie("username");
            if (username != null && username != "") {
                alert("Welcome again " + username);
            }
            else {
                username = prompt("Please enter your name:", "");
                if (username != null && username != "") {
                    setCookie("username", username, 365);
                }
 
            }
 
        }
    </script>