function getCookie(c_name){
	var cookie_value = '';
	var allcookie = document.cookie;
	var cookie_str = c_name + '=';
	var pos = allcookie.indexOf(cookie_str);
	if(pos != -1){
		var start = pos + cookie_str.length;
		var end = allcookie.indexOf(';', start);
		if(end == -1) end = allcookie.length;
		cookie_value = allcookie.substring(start, end);
		cookie_value = unescape(cookie_value);
	}
	return cookie_value;
}