/**
 * 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) {

	if (document.cookie) {
		var cookies = document.cookie.split('; ');
		for (var i = 0; i < cookies.length; i++) {
			if (cookies[i].length > (name.length + 1) && cookies[i].indexOf(name + "=") == 0) {
				var cookie = cookies[i].substring(name.length + 1, cookies[i].length);
				return unescape(cookie);
			}
		}
	}
	return null;
}

/**
 * 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";
	}
}