var popupfeatures = "toolbar=no,location=no,directories=no,status=yes,menubar=no,scrollbars=yes,resizable=yes,width=710,height=600";
function popUp(myurl) {var win = open(myurl,'popupwindow',popupfeatures);win.focus();}		


function IsEmail(email) 
{
	invalidChars = " ~\'^\`\"*+=\\|][(){}$&!#%/:,;";
	
	// Check for null
	if (email == "") return false;

	// Check for invalid characters as defined above
	for (i=0; i<invalidChars.length; i++) 
	{
		badChar = invalidChars.charAt(i);
		if (email.indexOf(badChar,0) > -1) return false;
	}
	
	lengthOfEmail = email.length;
	if ((email.charAt(lengthOfEmail - 1) == ".") || (email.charAt(lengthOfEmail - 2) == ".")) return false;
	
	Pos = email.indexOf("@",1);
	if (email.charAt(Pos + 1) == ".") return false;
	
	while ((Pos < lengthOfEmail) && ( Pos != -1)) 
	{
		Pos = email.indexOf(".",Pos);
		if (email.charAt(Pos + 1) == ".") return false;
		if (Pos != -1) Pos++;
	}

	// There must be at least one @ symbol
	atPos = email.indexOf("@",1);
	if (atPos == -1) return false;

	// But only ONE @ symbol
	if (email.indexOf("@",atPos+1) != -1) return false;

	// Also check for at least one period after the @ symbol
	periodPos = email.indexOf(".",atPos);
	if (periodPos == -1) return false;

	if (periodPos+3 > email.length) return false;

	return true;
}

function CheckForm()
{	
	var Message='';		
	
	var Email=document.subscribeform.email.value.replace('Enter your email address','');
	if (Email.length == 0) Message=Message + 'Email' + '\n';
	if (Message.length !== 0) {alert('You must enter the following fields:\n\n'+Message); return false;}
	else if (!IsEmail(Email)) {alert('The email address that you have entered is not valid'); return false;}
	else return true;
}	

function CheckRetrieveForm()
{	
	var Message='';		
	if (document.RetrieveForm.Email.value.length == 0) Message=Message + 'Email' + '\n';
	if (Message.length !== 0) {alert('You must enter the following fields:\n\n'+Message); return false;}
	else if (IsEmail(document.RetrieveForm.Email.value) == false) {alert('The email address that you have entered is not valid'); return false;}
	else return true;
}	

function CheckUnsubscribeForm()
{	
	var Message='';		
	if (document.UnsubscribeForm.Email.value.length == 0) Message=Message + 'Email' + '\n';
	if (Message.length !== 0) {alert('You must enter the following fields:\n\n'+Message); return false;}
	else if (IsEmail(document.UnsubscribeForm.Email.value) == false) {alert('The email address that you have entered is not valid'); return false;}
	else return true;
}