function toggleFeedbackForm(){
	var div1 = document.getElementById('feedback_form_container');
	var div2 = document.getElementById('feedback_wrapper');
	if (div1.style.display == 'none') {
		div1.style.display = 'block';
		div2.style.display = 'block'
	} else {
		div1.style.display = 'none';
		div2.style.display = 'none'
	}

	var div1 = document.getElementById('feedback_link');
	if (div1.innerHTML == 'Feedback') {
		div1.innerHTML = 'Close'
	} else {
		div1.innerHTML = 'Feedback'
	}
}

function submitFeedback(){

    var feedbackform = document.getElementById('feedback_form');

    if (!feedbackform) return false;

    var message = feedbackform.message.value;
    if (!message){
        showFeedbackMessage('Please fill required filed.');
        return false;
    }
    var email = feedbackform.email.value;

    clearFeedbackMessage();
    var url = '/pages/feedback/?message='+encodeURIComponent(message)+'&url='+top.location.href+((email)?'&email='+encodeURIComponent(email)+'':'');
    makeRequest(url);

    return false;
}

function showFeedbackMessage(message){
    var feedbackform_messagefield = document.getElementById('feedback_form_message');
    feedbackform_messagefield.innerHTML = message;
}

function clearFeedbackMessage(){
    var feedbackform_messagefield = document.getElementById('feedback_form_message');
    feedbackform_messagefield.innerHTML = '';
}

function makeRequest(url) {
    var http_request = false;
    if (window.XMLHttpRequest) { // Mozilla, Safari, ...
        http_request = new XMLHttpRequest();
        if (http_request.overrideMimeType) {
            http_request.overrideMimeType('text/xml');
        }
    } else if (window.ActiveXObject) { // IE
        try {
            http_request = new ActiveXObject("Msxml2.XMLHTTP");
        } catch (e) {
            try {
                http_request = new ActiveXObject("Microsoft.XMLHTTP");
            } catch (e) {}
        }
    }
    if (!http_request) {
        alert('Something wrong!');
        return false;
    }
    http_request.onreadystatechange = function() { alertContents(http_request); };
    http_request.open('GET', url, true);
    http_request.send(null);
}


function alertContents(http_request) {
    if (http_request.readyState == 4) {
        if (http_request.status == 200) {
//            showFeedbackMessage(http_request.responseText);
            alert(http_request.responseText);
            toggleFeedbackForm();
        } else {
            alert('Something wrong!');
        }
    }
}