function checkForm(submitButton) {
    var form = submitButton.form;
    if (form.elements["author"].value == '' || form.elements["author"].value == null) {
        alert('Please fill required field Author');
        return false;
    }
    
    if (form.elements["summary"].value == '' || form.elements["summary"].value == null) {
        alert('Please fill required field Summary');
        return false;
    }
    if (form.elements["filepath"].value == '' || form.elements["filepath"].value == null) {
        alert('Please fill required field Patch attachment');
        return false;
    }
    
    if (form.elements["email"].value == '' || form.elements["email"].value == null) {
        alert('Please fill required field Email');
        return false;
    }            
    return true;
}