var isNN = (navigator.appName.indexOf("Netscape")!=-1);

function autoTab(input,len, e) {
	var keyCode = (isNN) ? e.which : e.keyCode;
	var filter = (isNN) ? [0,8,9] : [0,8,9,13,16,17,18,37,38,39,40,46];
	if(input.value.length >= len && !containsElement(filter,keyCode)) {
		input.value = input.value.slice(0, len);
		input.form[(getIndex(input)+1) % input.form.length].focus();
}

function containsElement(arr, ele) {
	var found = false, index = 0;
	while(!found && index < arr.length)
		if(arr[index] == ele)
			found = true;
		else
	index++;
	return found;
}

function getIndex(input) {
	var index = -1, i = 0, found = false;
	while (i < input.form.length && index == -1)
	if (input.form[i] == input)index = i;
	else i++;
	return index;
	}
return true;
}

function validateForm(){
if (document.formpostos.cod4.value.length!='' || document.formpostos.cod3.value.length!='' ) {
  if (document.formpostos.cod4.value.length != 4 ){
    alert("Código postal inválido");
    return false;
  }
}

if (document.formpostos.cod4.value.length == ''  && document.formpostos.cod3.value.length == '' ) {
  document.formpostos.CodPostal.value = ''; }
  else {
  document.formpostos.CodPostal.value=document.formpostos.cod4.value+"-"+document.formpostos.cod3.value;
  }
  document.formpostos.action="postos.asp?distrito="+document.formpostos.distrito.value+"&CodPostal="+document.formpostos.CodPostal.value
  document.formpostos.submit();
  return true;
}

function validateFormMainPage(){
if (document.formpostos.cod4.value.length!='' || document.formpostos.cod3.value.length!='' ) {
  if (document.formpostos.cod4.value.length != 4 ){
    alert("Código postal inválido");
    return false;
  }
}

if (document.formpostos.cod4.value.length == ''  && document.formpostos.cod3.value.length == '' ) {
  document.formpostos.CodPostal.value = ''; }
  else {
  document.formpostos.CodPostal.value=document.formpostos.cod4.value+"-"+document.formpostos.cod3.value;
  }
  document.formpostos.action="bpa/postos.asp?distrito="+document.formpostos.distrito.value+"&CodPostal="+document.formpostos.CodPostal.value
  document.formpostos.submit();
  return true;
}

function HomePage(){
	document.FormBack.action="lista.asp"
  	document.FormBack.submit();
  return true;

}