/**

 * Read the JavaScript cookies tutorial at:

 *   http://www.netspade.com/articles/javascript/cookies.xml

 */



/**

 * Sets a Cookie with the given name and value.

 *

 * name       Name of the cookie

 * value      Value of the cookie

 * [expires]  Expiration date of the cookie (default: end of current session)

 * [path]     Path where the cookie is valid (default: path of calling document)

 * [domain]   Domain where the cookie is valid

 *              (default: domain of calling document)

 * [secure]   Boolean value indicating if the cookie transmission requires a

 *              secure transmission

 */

function setCookie(name, value, expires, path, domain, secure)

{

    document.cookie= name + "=" + escape(value) +

        ((expires) ? "; expires=" + expires.toGMTString() : "") +

        ((path) ? "; path=" + path : "") +

        ((domain) ? "; domain=" + domain : "") +

        ((secure) ? "; secure" : "");

}



/**

 * Gets the value of the specified cookie.

 *

 * name  Name of the desired cookie.

 *

 * Returns a string containing value of specified cookie,

 *   or null if cookie does not exist.

 */

function getCookie(name)

{

    var dc = document.cookie;

    var prefix = name + "=";

    var begin = dc.indexOf("; " + prefix);

    if (begin == -1)

    {

        begin = dc.indexOf(prefix);

        if (begin != 0) return null;

    }

    else

    {

        begin += 2;

    }

    var end = document.cookie.indexOf(";", begin);

    if (end == -1)

    {

        end = dc.length;

    }

    return unescape(dc.substring(begin + prefix.length, end));

}



/**

 * Deletes the specified cookie.

 *

 * name      name of the cookie

 * [path]    path of the cookie (must be same as path used to create cookie)

 * [domain]  domain of the cookie (must be same as domain used to create cookie)

 */

function deleteCookie(name, path, domain)

{

    if (getCookie(name))

    {

        document.cookie = name + "=" + 

            ((path) ? "; path=" + path : "") +

            ((domain) ? "; domain=" + domain : "") +

            "; expires=Thu, 01-Jan-70 00:00:01 GMT";

    }

}