function favorite(){
	document.getElementById("no_free").onclick = function fav_inf(){
		document.getElementById("pay").disabled = !this.checked;
	}
	document.getElementById("all").onclick = function fav_inf(){
		document.getElementById("pay").disabled = this.checked;
	}
	
	document.getElementById("free").onclick = function fav_inf(){
		document.getElementById("pay").disabled = this.checked;
	}
}