void script_3137(int arg0) {
	string svar0;
	if ((globalint_998 > 0) && (globalint_999 > 0)) {
		script_3143(1, "Please delete one of your existing favourite worlds before setting another.");
		return;
	}
	if (globalint_998 < 1) {
		script_1857(arg0);
	} else {
		if (globalint_999 < 1) {
			script_1858(arg0);
		}
	}
	globalint_998 = script_1853();
	globalint_999 = script_1854();
	script_3113();
	svar0 = "Your changes cannot be saved because" + "<br>" + "you are using the unsigned client.";
	if (((boolean)cs2method5420())) {
		script_3143(1, svar0);
	} else {
		script_3143(0, "World " + intToStr(arg0) + " has been added to your favourites.");
	}
	script_3065(1);
	return;
}