function checaFormulario(checar){
/*  if (checar.nome.value == ''){
    alert('Por favor coloque seu nome!');
    checar.nome.focus();
    return (false);
  }*/
  if (checar.email.value == ''){
    alert('O campo e-mail está vazio!');
    checar.email.focus();
    return (false);
  }
  else{
    var email = checar.email.value;
    if (email.length < 7 ||
    email.indexOf("@.") != -1 ||
    email.indexOf("-.") != -1 ||
    email.indexOf("_.") != -1 ||
    email.indexOf("..") != -1 ||
    email.indexOf("._") != -1 ||
    email.indexOf(".-") != -1 ||
    email.indexOf(".@") != -1 ||
    email.indexOf("@-") != -1 ||
    email.indexOf("@_") != -1 ||
    email.indexOf("@") == 0 ||
    email.indexOf("@") != email.lastIndexOf("@") ||
    email.indexOf("@") == -1 ||
    email.indexOf(".") == -1 ||
    (email.length - (email.lastIndexOf(".") + 1)) < 2) {
      alert('Email inválido!');
      checar.email.focus();
      return (false);
    }
    else {
      a = "abcdefghijklmnopqrstuvwxyz0123456789@-_.";
      b = 0;
      while (b < email.length) {
        if (a.indexOf(email.charAt(b)) == -1) {
          alert('Email inválido!');
          checar.email.focus();
          return (false);
          b = email.length;
        }
        b = b + 1;
      }
    }
  }
  return (true);
}

function checkCelType(key) {
  obj = document.checar.celular;
  if(event.keyCode < 48 || event.keyCode > 57){
    event.keyCode = null;
  }
  if(event.keyCode != 8 && obj.value.length == 0){
      obj.value = obj.value + "(";
  }
  else if(event.keyCode != 8 && obj.value.length == 3){
      obj.value = obj.value + ")";
  }
  else if(event.keyCode != 8 && obj.value.length == 8){
      obj.value = obj.value + "-";
  }
}