if (days) {

        var date = new Date();

        date.setTime(date.getTime()+(days*24*60*60*1000));

        var expires = "; expires="+date.toGMTString();

    }

    else var expires = "";

    document.cookie = name+"="+value+expires+"; path=/";

    return true;

}

​

function readCookie(name) {

    var nameEQ = name + "=";

    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,c.length);

        if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);

    }

    return null;

}

​

function showCookie(name)

{

    if(!name) {

        alert('\nPlease enter the name of cookie in the  cookie name field.');

        return false;

    }

    var val = readCookie(name);

    if(val){

        alert(readCookie(name));

    }

    else alert('Cookie "' + name + '" doesn\'t exist!');

}

​

function eraseCookie(name) {

    if(!name) {

        alert('\nPlease enter the name of cookie in the  cookie name field.');

        return false;

    }

    if(readCookie(name)){

        if(createCookie(name,"",-1)) {

            alert('Cookie "' + name + '" has been deleted!');        

        }

    }

    else alert('Cookie "' + name + '" doesn\'t exist!');

}

​

function addCookie()

{

    cookie_name = document.getElementById("cName").value.replace(/^\s+|\s+$/g,'');

    cookie_value = document.getElementById("cValue").value.replace(/^\s+|\s+$/g,'');

    if(cookie_name.length && cookie_value.length){

        createCookie(cookie_name, cookie_value, 7);

        alert("New cookie has been added, \ncookie name : " + cookie_name + "\ncookie value : " + cookie_value);

    }

    else{

        alert("Please enter a name and value for the cookie.");

    }

}

if(name = readCookie('name')) alert('Welcome back, ' + name);