function CheckFields() {
    var ergx = new RegExp('\\w+([-+.\']\w+)*@\\w+([-.]\\w+)*\\.\\w+([-.]\\w+)*');
    if (document.getElementById("newsletteremail").value == "")
    { alert("Please enter a email address."); return false; }
    if (!ergx.test(document.getElementById("newsletteremail").value))
    { alert("Invalid Email."); return false; }
}
//