function CheckOptedIn(sender, args) {
    args.IsValid = $(".OptInCheckbox input").is(":checked");
}

function CheckEmailGiven(sender, args) {
    var email = $(".EmailFieldInput").val()
    args.IsValid = IsEmailValid(email);
}

function CheckNameGiven(sender, args) {
    args.IsValid = $(".NameFieldInput").val().length > 0;
}

function IsEmailValid(address) {
    if(address.length == 0)
        return false;
    var reg = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;
    return reg.test(address);
}