var target ='';

function QuizRequestObject(){
/* inicializacia HTTP Requestu
*/
	var request_o;
	try{
		request_o = new XMLHttpRequest();
	} catch ( error ) {
		try {
			request_o = new ActiveXObject( "Microsoft.XMLHTTP" );
		} catch ( error ) {
			return false;
		}
	}
	return request_o;
}

var http = QuizRequestObject(); 

function QuizRefresh(id, Link, params){
/* nastavenie parametrov a zavolanie HTTP Requestu
*/
var data = document.frm_Response;
	
	if (id == 'radio') {
		data = document.frm_RadioResponse;
	}
	
	var value = '';

	if (params==null) {
		params = '';
		for (var i = 0; i < data.fld_Answer.length; i++) {
			if (data.fld_Answer[i].checked) {
				value = value + data.fld_Answer[i].value + ';';

			}
		}
		params += 'fld_Answer=' + value.substr(0, value.length - 1);
	}

	target = id;
	http.open('POST',Link);
	http.onreadystatechange = QuizHandleRefresh; 
	http.send(params);
}

function QuizHandleRefresh(){
/* osetrenie http requestu
*/	

	if (http.readyState == 4 && http.status == 200) { //Finished loading the response

		var sResponse = http.responseText;
//	alert (sResponse);
		document.getElementById(target).innerHTML = sResponse;
		return false;
	}
}

function ValidateQuiz(frm, id, Link, params) {
	var emptyform = isEmptyForm(frm);
	if (emptyform) {

	} else {
		QuizRefresh(id, Link, params);
	}
	return false;
}

function isEmptyForm(frm) {
// kontrola ci bola vyplnena nejaka hodnota
	var count = 0;
	for (var i = 0; i < frm.fld_Answer.length; i++) {
		if (frm.fld_Answer[i].checked) {count ++;}
	}
	return ((count > 0) ? false : true);
}