function getQuerystringParamByName(name) {
	var regexS, regex, results;
	regexS = "[\\?&]" + name + "=([^&#]*)";
	regex = new RegExp(regexS);
	results = regex.exec(location.href);
	if (results === null) {
		return null;
	} else {
		return (results[1] !== '') ? results[1] : null;
	}
}