/*
 * From: http://www.w3schools.com/JS/js_cookies.asp
 */

/**
 * Search for a cookie identified by c_name and returns
 * the value.
 * 
 * If none is found, returns null.
 * 
 * @param c_name the cookie name.
 * @return the cookie value, or null if none is set.
 */
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));
		}
	}
	return null;
}

/**
 * Sets/updates a cookie value.
 * 
 * @param c_name the cookie name
 * @param value the cookie value
 * @param expiredays how many days it shold be valid
 */
function setCookie(c_name, value, expiredays) {
	var exdate = new Date();
	exdate.setDate(exdate.getDate() + expiredays);
	document.cookie = c_name + "=" + escape(value)
			+ ((expiredays == null) ? "" : ";expires=" + exdate.toUTCString());
}