function getQuery(requiredName) {
	if (document.location.search.length > 0) {
		var search = document.location.search.substring(1, document.location.search.length);
		var params = search.split("&");
		for (param_num in params) {
			var namevalue = params[param_num].split("=");

			if (namevalue[0] == requiredName) {
				return namevalue[1];
			}
		}
	}

	return null;
}