function doBasicZipCheck(val, callback, errback) {
    if (/[0-9]{5}/.test(val)) {
        $.get("/go/includes/_zipValid.jsp", {'zc': val}, function(data) {
            if (eval(data)) {
                callback.call(self, val);
                return;
            }
            else {
                alert("We could not recognize the ZIP code you entered.\nPlease enter a valid ZIP code and try again.");
            }
        });
    }
    else {
        alert("Please enter a valid five-digit ZIP code");
    }
    if (typeof errback != "undefined") errback.call(self, val);
}