function showNewsletterForm()
{
	document.getElementById("popoverNewsletter").style.display = "block";		
}

function hideNewsletterForm()
{
	document.getElementById("popoverNewsletter").style.display = "none";
}

//////////////////////////////////////////////
// Newsletter email submission
//////////////////////////////////////////////

function onEmailKeyPress(event)
{
    if (event.keyCode==13)
    {
        submitform();
    }
}

function submitform()
{
	var oIframe = document.getElementById("emailer");
    var oDoc = oIframe.contentWindow || oIframe.contentDocument;
    if (oDoc.document) {
        oDoc = oDoc.document;
    }
	oDoc.UPTml27690.email.value = document.getElementById("emailProxy").value;
	if( UPTvalidateform(oDoc.UPTml27690) )
	{
		oDoc.UPTml27690.submit();
		document.getElementById("emailProxy").value = "";
	}
}

function emailCheck (emailStr) {
	var emailPat=/^(.+)@(.+)$/;
	var specialChars="\\(\\)<>@,;:\\\\\\\"\\.\\[\\]";
	var validChars="\[^\\s" + specialChars + "\]";
	var quotedUser="(\"[^\"]*\")";
	var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/;
	var atom=validChars + '+';
	var word="(" + atom + "|" + quotedUser + ")";
	var userPat=new RegExp("^" + word + "(\\." + word + ")*$");
	var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$");
	var matchArray=emailStr.match(emailPat);
	if (matchArray==null)
	{
		alert("Email address seems incorrect (check @ and .'s)");
		return false;
	}
	var user=matchArray[1];
	var domain=matchArray[2];
	if (user.match(userPat)==null)
	{
		alert("The username doesn't seem to be valid.");
		return false;
	}
	var IPArray=domain.match(ipDomainPat);
	if (IPArray!=null)
	{
		  for (var i=1;i<=4;i++) {
			if (IPArray[i]>255) {
				alert("Destination IP address is invalid!");
			return false;
			}
		}
		return true;
	}
	var domainArray=domain.match(domainPat);
	if (domainArray==null)
	{
		alert("The domain name doesn't seem to be valid.");
		return false;
	}
	var atomPat=new RegExp(atom,"g");
	var domArr=domain.match(atomPat);
	var len=domArr.length;
	if ((domArr[domArr.length-1] != "info") &&
		(domArr[domArr.length-1] != "name") &&
		(domArr[domArr.length-1] != "arpa") &&
		(domArr[domArr.length-1] != "coop") &&
		(domArr[domArr.length-1] != "aero"))
	{
			if (domArr[domArr.length-1].length<2 ||
				domArr[domArr.length-1].length>3)
			{
				alert("The address must end in a three-letter domain, or two letter country.");
				return false;
			}
	}
	if (len<2)
	{
	   var errStr="This address is missing a hostname!";
	   alert(errStr);
	   return false;
	}
	return true;
}

function UPTvalidateform(thisform)
{
	
	if (emailCheck(thisform.email.value)) 
	{	
		showNewsletterForm();
		document.getElementById("newsletterThanks").style.height = "115px";
		if (document.getElementById('unsubscribe') 
			&& !document.getElementById('unsubscribe').checked)
		{
			//alert('Thank you for signing up!');
		}
		else
		{
			//alert('Thank you for signing up!');
		}
		return true;
	}
	else
	{
		return false;
	}
}