var Newsletter_errorMsg = "<p>Please enter a valid email address.</p>";
var EmailChanged = false;

function Email_OnChange()
{
    EmailChanged = true;
}

function Email_OnClick()
{
    document.getElementById('newsletteremail').value = "";
    document.getElementById('newsletteremail').style.color = 'black';
}

function NewsletterSignUp()
{   
    var emailValid = Newsletter_ValidateEmail();
    
    if( emailValid == false )
    {
        return false;    
    }
    
    Newsletter_xmlhttpPost("/PageTemplates/FormProcessing.aspx?" + 
                "FormType=NewsletterSignup" +
                "&Email=" + escape(document.getElementById('newsletteremail').value) + "&SendNewsAndUpdates=1");
      
    return false;
}

function Newsletter_xmlhttpPost(strURL) 
{
    var xmlHttpReq = false;
    var self = this;
    // Mozilla/Safari
    if (window.XMLHttpRequest) {
        self.xmlHttpReq = new XMLHttpRequest();
    }
    // IE
    else if (window.ActiveXObject) {
        self.xmlHttpReq = new ActiveXObject("Microsoft.XMLHTTP");
    }
    self.xmlHttpReq.open('GET', strURL, true);
    self.xmlHttpReq.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
    self.xmlHttpReq.onreadystatechange = function() {
        if (self.xmlHttpReq.readyState == 4) {
            Newsletter_Updatepage(self.xmlHttpReq.responseText);
        }
    }
    self.xmlHttpReq.send(null);
}


function Newsletter_Updatepage(str)
{
    window.location = str;
}

function Newsletter_ValidateEmail()
{
    if(EmailChanged == true)
    {
        var email = document.getElementById('newsletteremail').value;
        if ( (email.indexOf("@") > 1) && //  must contain @, and it must not be the first character
              (email.lastIndexOf(".") > email.indexOf("@")) &&  // last dot must be after the @
              (email.indexOf("@") != email.length) &&  // @ must not be the last character
              (email.indexOf("..") < 0) && // two periods in a row is not valid
              (email.indexOf(".") != email.length) &&  // . must not be the last character
              (Quote_AllValidEmailChars(email)) ) // all characters must be valid
        {
            document.getElementById('Newsletter_ErDiv4').style.display = "none";
            document.getElementById('Newsletter_ErDiv4').innerHTML = "";
	        return true;
        }
        else
        {
            document.getElementById('Newsletter_ErDiv4').style.display = "";
            document.getElementById('Newsletter_ErDiv4').innerHTML = Newsletter_errorMsg;
            return false;
        }
    }
    else
    {
        document.getElementById('Newsletter_ErDiv4').style.display = "";
        document.getElementById('Newsletter_ErDiv4').innerHTML = Newsletter_errorMsg;
        return false;
    }
}

function Quote_AllValidEmailChars(email)
{
    var isValid = true;
    var validchars = "abcdefghijklmnopqrstuvwxyz0123456789@.-_";
    for (var i=0; i < email.length; i++) 
    {
        var letter = email.charAt(i).toLowerCase();
        if (validchars.indexOf(letter) != -1)
        {
          continue;
        }
        else
        {
            isValid = false;
            break;
        }
    }
    return isValid;
}