function validEmail(userlog){
  if (userlog == ""){
	return false
  }
  var invalidChars = " /\;:'"
  var badchar
  for(i=0;i < invalidChars.length;i++){
    badChar = invalidChars.charAt(i)
	if (userlog.indexOf(badChar,0) > -1){
	  return false
	}
  }
  atPos = userlog.indexOf("@",1)
  if (atPos == -1){
    return false
  }
  if (userlog.indexOf("@",atPos+1) > -1){
    return false
  }
  periodPos = userlog.indexOf(".",atPos)
  if (periodPos == -1){
    return false
  }
  if (periodPos+3 > userlog.length){
    return false
  }
return true
}

function valida(form){


  if (!validEmail(form.userlog.value)){
    alert("E-mail Invalido!")
	form.userlog.select()
	form.userlog.focus()
	return false
  }
   if (form.senhalog.value == ""){
    alert("O Campo Senha é obrigatório")
	form.senhalog.focus()
	return false
  }
  
  return true
}