function mascara(o,f) {
	if (f == 'telefone') {
		v = o.value;
		v = v.replace(/\D/g,"");
		v = v.replace(/^(\d\d)(\d)/g,"$1-$2");
		v = v.replace(/(\d{4})(\d)/,"$1-$2");
		o.value = v;
	}
	else if (f == 'cep') {
		v = o.value;
		v = v.replace(/\D/g,"");
		v = v.replace(/^(\d{5})(\d)/,"$1-$2");
		o.value = v;
	}
        else if (f == 'data') {
                v = o.value;
                v = v.replace(/\D/g,"");
                v = v.replace(/^(\d{2})(\d)/,"$1/$2");
		v = v.replace(/(\d{2})(\d)/,"$1/$2");
                o.value = v;
        }
}

function valida_email(o) {
	if (o.value != "") {
		if (!(/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,4})+$/.test(o.value))) { 
			window.alert("Por favor, digite um email válido.");
			o.value = "";			
			o.focus();
    		}
	}
}