function isEmailAddr(email)
{
  var result = false;
  var theStr = new String(email);
  var index = theStr.indexOf("@");
  if (index > 0)
  {
    var pindex = theStr.indexOf(".",index);
    if ((pindex > index+1) && (theStr.length > pindex+1))
	result = true;
  }
  return result;
}

function validRequired(formField,fieldLabel)
{
	var result = true;
	
	if (formField.value == "")
	{
		alert('Por favor preencha o campo "' + fieldLabel +'".');
		formField.focus();
		result = false;
	}
	
	return result;
}

function allDigits(str)
{
	return inValidCharSet(str,"-0123456789");
}

function inValidCharSet(str,charset)
{
	var result = true;

	// Note: doesn't use regular expressions to avoid early Mac browser bugs	
	for (var i=0;i<str.length;i++)
		if (charset.indexOf(str.substr(i,1))<0)
		{
			result = false;
			break;
		}
	
	return result;
}

function validEmail(formField,fieldLabel,required)
{
	var result = true;
	
	if (required && !validRequired(formField,fieldLabel))
		result = false;

	if (result && ((formField.value.length < 3) || !isEmailAddr(formField.value)) )
	{
		alert("Por favor preencha o campo de e-mail de forma completa: seunome@seudominio.com");
		formField.focus();
		result = false;
	}
   
  return result;

}

function validSenha(formSenha,formConfirma)
{
	var result = true;
	
	if (formSenha.value != formConfirma.value)
	{
		alert('Por favor preencha os campos de senha de forma idêntica.');
		formSenha.focus();
		result = false;
	}
	
	return result;
}
function limpaForm(formField)
{
	if (formField.defaultValue == formField.value) {
		formField.value = "";
	}
}

var voto;
function seleciona(optvalue) {
	voto = optvalue;
}
function verifica(largura,altura) {
	if ( voto ) { 
		if (!DisplayInfo()) { return false; }
	}
	else {  
		alert('Por favor, selecione uma das opções.'); 
		return false;
	}
}
<!-- Activate Cloaking
function getCookieVal (offset)
   {
   var endstr = document.cookie.indexOf (";", offset);
   if (endstr == -1)
      endstr = document.cookie.length;
   return unescape(document.cookie.substring(offset, endstr));
   }
function GetCookie (name)
   {
   var arg = name + "=";
   var alen = arg.length;
   var clen = document.cookie.length;
   var i = 0;
   while (i < clen)
      {
      var j = i + alen;
      if (document.cookie.substring(i, j) == arg)
         return getCookieVal (j);
      i = document.cookie.indexOf(" ", i) + 1;
      if (i == 0)
         break;
      }
   return null;
   }
function SetCookie (name, value)
   {
   var argv = SetCookie.arguments;
   var argc = SetCookie.arguments.length;
   var expires = (2 < argc) ? argv[2] : null;
   var path = (3 < argc) ? argv[3] : null;
   var domain = (4 < argc) ? argv[4] : null;
   var secure = (5 < argc) ? argv[5] : false;
   document.cookie = name + "=" + escape (value) +
     ((expires == null) ? "" : ("; expires=" + expires.toGMTString())) +
     ((path == null) ? "" : ("; path=" + path)) +
     ((domain == null) ? "" : ("; domain=" + domain)) +
	((secure == true) ? "; secure" : "");
   }
function DisplayInfo()
   {
   var expdate = new Date();
   var visit;
   // Set expiration date to a year from now.
   expdate.setTime(expdate.getTime() +  (24 * 60 * 60 * 1000 * 365));
   if(!(visit = GetCookie("zonafranca"))) {
		visit = 0;
   }
   visit++;
   SetCookie("zonafranca", visit, expdate, "/", null, false);
   if(visit > 1 ){
      alert("É permitido apenas 1 voto por enquete. Obrigado.");
      return false;
   }
   else {
      return true;
   }
}
function ResetCounts()
   {
   var expdate = new Date();
   expdate.setTime(expdate.getTime() +  (24 * 60 * 60 * 1000 * 365));
   visit = 0;
   SetCookie("visit", visit, expdate , "/", null, false);
   leapto();
   }
// De-activate Cloaking -->
<!--
function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}
//-->