function createCookie(name, value, days)
{
    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=/";
}

function getCookie(c_name)
{
    if (document.cookie.length > 0)
    {
        c_start = document.cookie.indexOf(c_name + "=");
        if (c_start != -1)
        {
            c_start = c_start + c_name.length + 1;
            c_end=document.cookie.indexOf(";", c_start);
            if (c_end == -1)
            {
                c_end = document.cookie.length;
            }
            return unescape(document.cookie.substring(c_start, c_end));
        }
    }
    else
    {
        return null;
    }
}

function deleteCookie(name)
{
    createCookie(name, "", -1);
}