var _BROWSER_IS_IE =
    (document.all
     && window.ActiveXObject
     && navigator.userAgent.toLowerCase().indexOf("msie") > -1
     && navigator.userAgent.toLowerCase().indexOf("opera") == -1);

var _BROWSER_IS_OPERA =
    (navigator.userAgent.toLowerCase().indexOf("opera") != -1);

CookieManager = Class.create();
CookieManager.prototype =
{
    userDataForIE: false,

    initialize: function(userDataForIE)
    {
        this.cookieShelfLife = 30;
        this.userDataForIE = userDataForIE;

        if (_BROWSER_IS_IE && this.userDataForIE)
        {
            this.IE_CACHE_NAME = "storage";
            if ($(this.IE_CACHE_NAME) == null)
            {
                var div = document.createElement("DIV");
                div.id = this.IE_CACHE_NAME;
                document.body.appendChild(div);
            }
            this.store = $(this.IE_CACHE_NAME);
            this.store.style.behavior = "url('#default#userData')";
        }
    },

    getCookie: function(aCookieName)
    {
        var result = null;
        if (_BROWSER_IS_IE && this.userDataForIE)
        {
            this.store.load(this.IE_CACHE_NAME);
            result = this.store.getAttribute(aCookieName);
        }
        else
        {
            for (var i = 0; i < document.cookie.split('; ').length; i++)
            {
                var crumb = document.cookie.split('; ')[i].split('=');
                if (crumb[0] == aCookieName && crumb[1] != null)
                {
                    result = crumb[1];
                    break;
                }
            }
        }

        if (_BROWSER_IS_OPERA && result != null)
        {
            result = result.replace(/%22/g, '"');
        }
        return result;
    },

    setCookie: function(aCookieName, aCookieValue)
    {
        if (_BROWSER_IS_IE && this.userDataForIE)
        {
            this.store.setAttribute(aCookieName, aCookieValue);
            this.store.save(this.IE_CACHE_NAME);
        }
        else
        {
            if (_BROWSER_IS_OPERA)
            {
                aCookieValue = aCookieValue.replace(/"/g, "%22");
            }
            var date = new Date();
            date.setTime(date.getTime() + (this.cookieShelfLife * 24*60*60*1000));
            var expires = '; expires=' + date.toGMTString();
            document.cookie = aCookieName + '=' + aCookieValue + expires + '; path=/';
        }
    },

    clearCookie: function(aCookieName)
    {
        if (_BROWSER_IS_IE && this.userDataForIE)
        {
            this.store.load(this.IE_CACHE_NAME);
            this.store.removeAttribute(aCookieName);
            this.store.save(this.IE_CACHE_NAME);
        }
        else
        {
            document.cookie =
                aCookieName + '=;expires=Thu, 01-Jan-1970 00:00:01 GMT; path=/';
        }
    }
}