function checkField(form, field, msg){
  var res;
  res=true;
  var str=trim(form.elements[field].value);

  if (str==""){
    res=false;
    //form.elements[field].focus();
  }
  return res;
}

function checkFieldSelect(form, field){
  var res;
  res=true;
  if (form.elements[field].selectedIndex==0){
    res=false;
    //form.elements[field].focus();
  }
  return res;
}

function msgErroCamposEmFalta(str){
  alert("É impossivel continuar, por favor verifique os seguintes campos:\n\n\n"+str);
}

function trim(s){
  // Remove leading spaces and carriage returns
  while ((s.substring(0,1) == ' ') || (s.substring(0,1) == '\n') || (s.substring(0,1) == '\r'))
  s = s.substring(1,s.length);

  // Remove trailing spaces and carriage returns
  while ((s.substring(s.length-1,s.length) == ' ') || (s.substring(s.length-1,s.length) == '\n') || (s.substring(s.length-1,s.length) == '\r'))
  s = s.substring(0,s.length-1);

  return s;
}

function confirmacaoAccao(msgConf, msgConf_alt){
  return confirm(msgConf+"\n"+msgConf_alt);
}


function openWindow(url, windowName, popW, popH){
  var winHeight=popH;
  var winWidth=popW;
  var winLeft = (screen.width - winWidth) / 2;
  var winUp = (screen.height - winHeight) / 2
  newwindow=window.open(url,windowName,'height='+winHeight+'px,width='+winWidth+'px,left='+winLeft+',top='+winUp+',resizable=true,scrollbars=yes,toolbar=no,menubar=no,status=no,location=no');
  if (!newwindow.opener) newwindow.opener = self;

  newwindow.focus();
}

function isCheckboxSelected (f) {
  var checked = false, e, i = 0;

  while (e = f.elements[i++])
  if (e.type == 'checkbox' && e.checked)
  checked = true;

  return checked;
}

function checkIfOnlyLetters(checkStr){
  // allow ONLY alphanumeric keys, no symbols or punctuation
  // this can be altered for any "checkOK" string you desire
  var checkOK = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
  var allValid = true;
  for (i = 0;  i < checkStr.length;  i++)
  {
    ch = checkStr.charAt(i);
    for (j = 0;  j < checkOK.length;  j++)
    if (ch == checkOK.charAt(j))
    break;
    if (j == checkOK.length)
    {
      allValid = false;
      break;
    }
  }
  return allValid;
}

function checkIfNumber(checkStr){
  // allow ONLY numeric keys, no symbols or punctuation
  // this can be altered for any "checkOK" string you desire
  var checkOK = "0123456789.";
  var allValid = true;
  for (i = 0;  i < checkStr.length;  i++)
  {
    ch = checkStr.charAt(i);
    for (j = 0;  j < checkOK.length;  j++)
    if (ch == checkOK.charAt(j))
    break;
    if (j == checkOK.length)
    {
      allValid = false;
      break;
    }
  }
  return allValid;
}


function left(str, n){
  if (n <= 0)
  return "";
  else if (n > String(str).length)
  return str;
  else
  return String(str).substring(0,n);
}
function right(str, n){
  if (n <= 0)
  return "";
  else if (n > String(str).length)
  return str;
  else {
    var iLen = String(str).length;
    return String(str).substring(iLen, iLen - n);
  }
}

function checkUncheckAll(theElement) {
  var theForm = theElement.form, z = 0;
  for(z=0; z<theForm.length;z++){
    if(theForm[z].type == 'checkbox' && theForm[z].name != 'checkall'){
      theForm[z].checked = theElement.checked;
    }
  }
}


function refreshFrame(frameName) {
	//parent.frames[frameName].location = parent.frames[frameName].location.href;
  opener.parent[frameName].location=opener.parent[frameName].location.href;
}

function changeTblCCVisibility(visibility, tblID){
  if(visibility=="on") document.getElementById(tblID).style.display  = "block";
  else if(visibility=="off") document.getElementById(tblID).style.display  = "none";
}

function showHideTable(tblID){
  if (document.getElementById(tblID).style.display == 'none') {
    document.getElementById(tblID).style.display = 'block';
  }
  else {
    document.getElementById(tblID).style.display = 'none';
  }
}

function ismaxlength(obj){
  var mlength=obj.getAttribute? parseInt(obj.getAttribute("maxlength")) : "";
  if (obj.getAttribute && obj.value.length>mlength)
  obj.value=obj.value.substring(0,mlength)
}

function updateProduct(item){
  var preco, qtd, preco_total, outro_preco;
  
  if(document.getElementById('txtOutroPreco['+item+']')!=undefined){
    outro_preco=document.getElementById('txtOutroPreco['+item+']').value;
  }
  else outro_preco=0;

  qtd=document.getElementById('txtQtd['+item+']').value

  if(outro_preco>0) preco=outro_preco;        
  else preco=(document.getElementById('txtPrecoUnitario['+item+']').value);
  
  preco_total=preco*qtd;

  document.getElementById('txtPreco['+item+']').value=preco_total.toFixed(2);
  document.getElementById('lblPreco_'+item).innerHTML=preco_total.toFixed(2);
  
}

function rmvProduct(id){
  if(!confirmacaoAccao("Deseja remover este Produto do seu Carrinho?","")) return false; //afinal parece que não quer remover
  this.location.href="products.php?accao=remove_product_cart&id="+id;
}

function updateMonthDay(nameM,nameY,updateField){
  var valueM=document.getElementById(nameM).value;
  var valueY=document.getElementById(nameY).value;
  
  document.getElementById(updateField).value=valueM+"/"+valueY;
}

function copyFieldValues_facturacao(){
  document.getElementById("factura_nome").value=document.getElementById("entrega_nome").value;
  document.getElementById("factura_morada").value= document.getElementById("entrega_morada").value;
  document.getElementById("factura_cod_postal_localidade").value= document.getElementById("entrega_cod_postal_localidade").value;
  document.getElementById("factura_telefone").value= document.getElementById("entrega_telefone").value;
}