function formataCPF(obj){
	var cpf="";
	if(obj && obj.value != ""){
		cpf = obj.value.replace(/[^0-9]/gi, "");
		var a = (cpf.length > 0) ?     cpf.substr(0,3) : "";
		var b = (cpf.length > 3) ? "."+cpf.substr(3,3) : "";
		var c = (cpf.length > 6) ? "."+cpf.substr(6,3) : "";
		var d = (cpf.length > 9) ? "-"+cpf.substr(9,2) : "";
		obj.value = a+b+c+d;
	}
}