//#############################################
//# Criado por Fernando de Barros Prado Alves #
//#                22/11/2008                 #
//# Validador de CPF       #
//#############################################

function validaCPF(url, metodo, modo) {
	
	cpf = document.cadastro.cpfID.value;
    remoto  = new ajax();
    xmlhttp = remoto.enviar(url + "?login=" + cpf, metodo, modo);
    if(xmlhttp) {
        document.getElementById('alerta3').className = 'erro';
        document.getElementById("alerta3").innerHTML = 'CPF já cadastrado!';
    } else {
        document.getElementById('alerta3').className = 'ok';
        document.getElementById("alerta3").innerHTML = ' ';  
	}
	
	erro = new String;
	if (cpf.length < 11) erro += "Sao necessarios 11 digitos para verificacao do CPF! \n\n"; 
	var nonNumbers = /\D/;
	if (nonNumbers.test(cpf)) erro += "A verificacao de CPF suporta apenas numeros! \n\n"; 
	if (cpf == "00000000000" || cpf == "11111111111" || cpf == "22222222222" || cpf == "33333333333" || cpf == "44444444444" || cpf == "55555555555" || cpf == "66666666666" || cpf == "77777777777" || cpf == "88888888888" || cpf == "99999999999"){
		erro += "Numero de CPF invalido!";
	}
	var a = [];
	var b = new Number;
	var c = 11;
	for (i=0; i<11; i++){
		a[i] = cpf.charAt(i);
		if (i < 9) b += (a[i] * --c);
	}
	if ((x = b % 11) < 2) { a[9] = 0 } else { a[9] = 11-x }
	b = 0;
	c = 11;
	for (y=0; y<10; y++) b += (a[y] * c--); 
	if ((x = b % 11) < 2) { a[10] = 0; } else { a[10] = 11-x; }
	if ((cpf.charAt(9) != a[9]) || (cpf.charAt(10) != a[10])){
		erro +="Digito verificador com problema!";
	}
	if (erro.length > 0){
		alert(erro);
		return false;
	}
	return true;
		
}