function val_login(){
var e = document.login.e.value
var eLength = document.login.e.value.length
      if(eLength<1 || e==""){
      alert("Por favor preencha o campo: ' E-mail: '");
      document.login.e.focus()
      return false
      }
var s = document.login.s.value
var sLength = document.login.s.value.length
      if(sLength<1 || s==""){
      alert("Por favor preencha o campo: ' Senha: '");
      document.login.s.focus()
      return false
      }
}