function getRequestParam(name) {
	if(location.search != null) {
		var query = location.search.substring(1);
		var params = query.split("&");
		for(i = 0; i < params.length; i++) {
			param = params[i].split("=");
			if(param[0] == name) {
				return param[1];
			}
		}
	}
	return null;
}

function getRequestParam(name, def) {
	var res = getRequestParam(name);
	if(res == null) res = def;
	return res;
}