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 function setCookie(cname, cvalue, exdays) {
    var d = new Date();
    d.setTime(d.getTime()   (exdays*24*60*60*1000));
    var expires = "expires=" d.toUTCString();
    document.cookie = cname   "="   cvalue   ";"   expires   ";path=/";
}

function getCookie(cname) {
    var name = cname   "=";
    var ca = document.cookie.split(';');
    for(var i = 0; i < ca.length; i  ) {
        var c = ca[i];
        while (c.charAt(0) == ' ') {
            c = c.substring(1);
        }
        if (c.indexOf(name) == 0) {
            return c.substring(name.length, c.length);
        }
    }
    return "";
}

function checkCookie() {
    var user = getCookie("username");
    if (user != "") {
        alert("Welcome again "   user);
    } else {
        user = prompt("Please enter your name:", "");
        if (user != "" amp;amp; user != null) {
            setCookie("username", user, 365);
        }
    }
}
setCookie('name', 'value', 1);
checkCookie();