function NewsletterSubmit(){              
        $.ajax({
            type: "POST",
            url: "EmailNewsletter.aspx",
            cache: false,
            data: "email=" + $("#tbNewsLetter").val(),
            beforeSend: function(){
                $("#newsLetter .submitbtn").toggle();
                $("#newsLetterMessage").text("loading...");
            },
            error: function(e){
                alert(e.statusText);
            },
            success: function(response)
            {
                if(response=="true")
                {
                    $("#newsLetterMessage").text("thank you");
                    $("#tbNewsLetter").toggle();
                }
                else
                {
                    $("#newsLetterMessage").text("*email not valid");
                    $("#newsLetter .submitbtn").toggle();
                }                                
            }
        });
}