function submitFeedbackForm(form) {
    var doSubmit = true;
    if (form.name.value == "") {
        document.getElementById("form_err_name").style.display = "block";
        form.name.className = "form_value error_input"
        doSubmit = false;
    }
    if (!form.email.value.match(/[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+/)) {
        document.getElementById("form_err_email").style.display = "block";
        form.email.className = "form_value error_input"
        doSubmit = false;
    }
    if (form.subject.value == "") {
        document.getElementById("form_err_subject").style.display = "block";
        form.subject.className = "form_value error_input"
        doSubmit = false;
    }
    if (form.message.value == "") {
        document.getElementById("form_err_message").style.display = "block";
        form.message.className = "areText error_input"
        doSubmit = false;
    }
    if (form.captcha.value == "") {
        document.getElementById("form_err_captcha").style.display = "block";
        form.captcha.className = "form_value error_input"
        doSubmit = false;
    }
    return doSubmit;
}