function ajax_async(url,format,callback){
	var xhr = ajax_get_xhr();
	if (xhr==null) return false;

	xhr.onreadystatechange = function(){
		if (xhr.readyState==4){
			if (format=='xml') callback(xhr.responseXML,xhr.status);
			else callback(xhr.responseText,xhr.status);
		}
	}
	xhr.open('GET',url,true);
	xhr.send(null);

	return true;
}

function ajax_sync(url,format){
	var xhr = ajax_get_xhr();
	if (xhr==null) return false;

	xhr.open('GET',url,false);
	xhr.send(null);

	return format=='xml'?xhr.responseXML:xhr.responseText;
}

function ajax_get_xhr(){
	try{
		xhr = new ActiveXObject('Msxml2.XMLHTTP');
	}catch(e){
		try{
			xhr = new ActiveXObject('Microsoft.XMLHTTP');
		}catch (e){
			xhr = new XMLHttpRequest();
		}
	}
	return xhr;
}

/* For product page */
function setWorthy(rid,rate){
	var el = document.getElementById('worthy_text2'+rid);
	/*window['worthy_text2_'+rid] = el.innerHTML; // Store original text
	el.innerHTML = worthy_msg[2];*/

	var func = function(result,status){worthyReady(rid,rate,result,status)};
	ajax_async('ajax.php?ct=review_rate&rid='+rid+'&rate='+rate+'&f='+Math.random(),'text',func);
}

function worthyReady(rid,rate,result,status){
	if (status==200){
		w1 = parseInt(document.getElementById('worthy'+rid).innerHTML);
		w2 = parseInt(document.getElementById('unworthy'+rid).innerHTML);
		if (rate==1) w1++;
		else w2++;

		/*document.getElementById('worthy_score'+rid).innerHTML = w1;
		document.getElementById('worthy_text1'+rid).innerHTML = w1+'/'+(w1+w2)+worthy_msg[1];
		document.getElementById('worthy_text2'+rid).innerHTML = worthy_msg[3];*/
		if (result == 1){
			document.getElementById('worthy_score'+rid).innerHTML = w1;
			document.getElementById('worthy'+rid).innerHTML = w1;
			document.getElementById('unworthy_score'+rid).innerHTML = w2;
			document.getElementById('unworthy'+rid).innerHTML = w2;
			if (rate == 1){
				$('#yes'+rid).find('img').addClass('active');
				$('#yes'+rid).find('img').attr('src','/images/icon/liked.png');
			}else{
				$('#no'+rid).find('img').addClass('active');
				$('#no'+rid).find('img').attr('src','/images/icon/disliked.png');
			}
		}
	}else{
		document.getElementById('worthy_text2'+rid).innerHTML = '<span class="error">系統發生錯誤，未能提交您的評價，請稍候重試 (錯誤碼：'+status+')</span>';
		setTimeout('resetWorthyText('+rid+')',5000);
	}
}

function resetWorthyText(rid){
	document.getElementById('worthy_text2'+rid).innerHTML = window['worthy_text2_'+rid];
}