/* - - - - - - - - - - - - - - - - - - - - - - -
Ajax Javascript
 - - - - - - - - - - - - - - - - - - - - - - - */
var ie45,ns6,ns4,dom;
if (navigator.appName=="Microsoft Internet Explorer") ie45=parseInt(navigator.appVersion)>=4;
else if (navigator.appName=="Netscape"){  ns6=parseInt(navigator.appVersion)>=5;  ns4=parseInt(navigator.appVersion)<5;}
dom=ie45 || ns6;

var http=createRequestObject();
var http_request = false;
var objectId = '';
var loadok = 0;

function createRequestObject(htmlObjectId){
    var obj;
    var browser = navigator.appName;
    if(browser == "Microsoft Internet Explorer"){
        obj = new ActiveXObject("Msxml2.XMLHTTP");
    }
    else{
        obj = new XMLHttpRequest();
    }
    return obj;    
}

function send_post(strurl, parameters,objId) {      
	  
	  objectId = objId;
	  //lert (parameters);
	  //alert (parameters);
      http.open('POST', strurl, true);
      http.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
      http.setRequestHeader("Content-length", parameters.length);
      http.setRequestHeader("Connection", "close");
	  http.onreadystatechange = handleResponse;
      http.send(parameters);
}

function sendReq(serverFileName, variableNames, variableValues,objId) {
	var paramString = '';
	
	objectId = objId;
	
	variableNames = variableNames.split(',');
	variableValues = variableValues.split(',');
	
	for(i=0; i<variableNames.length; i++) {
		paramString += variableNames[i]+'='+variableValues[i]+'&';
	}
	paramString = paramString.substring(0, (paramString.length-1));
			
	if (paramString.length == 0) {
	   	http.open('get', serverFileName);
	}
	else {
		http.open('get', serverFileName+'?'+paramString);
	}
    http.onreadystatechange = handleResponse;
    http.send(null);
}


function handleResponse() {
	if (http.readyState == 4) {
		responseText = http.responseText;
		//alert (responseText);
		getobj(objectId).innerHTML = responseText;
    } else {
		getobj(objectId).innerHTML = "<br><div align=center><img src='images/loading.gif' border=0><br>&#272;ang l&#7845;y d&#7919; li&#7879;u ...</div>";
	}
		
}

function change_icon(imgDocID,url) {
document.images[imgDocID].src = url;
}  

function showhide(id) {
el = document.all ? document.all[id] :   dom ? document.getElementById(id) :   document.layers[id];
els = dom ? el.style : el;
  if (dom){
    if (els.display == "none") {
        els.display = "";
      } else {
        els.display = "none";
      }
    }
  else if (ns4){
    if (els.display == "show") {
        els.display = "hide";
      } else { 
      els.display = "show";
         }
  }
}

function getobj(id) {
el = document.all ? document.all[id] :   dom ? document.getElementById(id) :   document.layers[id];
return el;
}

function showobj(id) {
obj=getobj(id);
els = dom ? obj.style : obj;
 	if (dom){
	    els.display = "";
    } else if (ns4){
        els.display = "show";
  	}
}

function hideobj(id) {
obj=getobj(id);
els = dom ? obj.style : obj;
 	if (dom){
	    els.display = "none";
    } else if (ns4){
        els.display = "hide";
  	}
}

function openPopUp(url, windowName, w, h, scrollbar) {
   var winl = (screen.width - w) / 2;
   var wint = (screen.height - h) / 2;
   winprops = 'height='+h+',width='+w+',top='+wint+',left='+winl+',scrollbars='+scrollbar+',location=no,directories=no,status=no,menubar=no,toolbar=no,resizable=yes';
   win = window.open(url, windowName, winprops);
   if (parseInt(navigator.appVersion) >= 4) { 
       	win.window.focus(); 
   } 
}

function show_guestbook(f) {
	showhide('ext_guestbook');
	furl = 'act:add_guestbook';	
	sendReq('index.php','vnTRUST',furl,'ext_guestbook');
}

function do_add(f) {
		var re =/^[a-z][a-z0-9]+[@][a-z0-9]+([.][a-z]+)+$/gi;
		var name = f.name.value;
		if (name == '') {
			alert('Vui long nhap ten cua ban');
			f.name.focus();
			return false;
		}
		
		var email = f.email.value;
		if (email == ''){
			alert("Xin nhap dia chi Email");
			f.email.focus();
			return false;
		}
		if (email.match(re)==null)
		{
			alert('Email khong hop le');
			f.email.focus();
			return false;
		}
		
		var content = f.content.value;
		if (content == ''){
			alert("Xin vui long nhap vao noi dung yeu cau");
			return false;
		}
		
		
		var h_code= f.h_code.value;
		if (f.h_code.value != f.code.value) {
			alert('Vui long nhap day so ma quy khach nhin thay');
			f.code.focus();
			return false;
		}
	var gender = f.gender.value;
	var strpara = 'name='+encodeURIComponent(name)+'&email='+encodeURIComponent(email)+'&content='+encodeURIComponent(content);
	furl = 'index.php?vnTRUST=act:add_guestbook|ok:1|gender:'+gender+'|h_code:'+f.h_code.value+'|code:'+f.code.value;
	send_post(furl,strpara,'ext_guestbook');
	return false;
}

function do_sendmail(f) {
		var re =/^[a-z][a-z0-9]+[@][a-z0-9]+([.][a-z]+)+$/gi;
	
		var y_email = f.y_email.value;
		if (y_email == ''){
			alert("Xin nhap dia chi Email cua ban");
			f.y_email.focus();
			return false;
		}
		if (y_email.match(re)==null)
		{
			alert('Email cua ban khong hop le');
			f.y_email.focus();
			return false;
		}
		
		var f_email = f.f_email.value;
		if (f_email == ''){
			alert("Xin nhap dia chi Email ban muon gui");
			f.f_email.focus();
			return false;
		}
		if (f_email.match(re)==null)
		{
			alert('Email muon gui khong hop le');
			f.f_email.focus();
			return false;
		}
	
		var content = f.content.value;
		if (content == ''){
			alert("Xin vui long nhap vao noi dung muon gui");
			return false;
		}
		
		
		var h_code= f.h_code.value;
		if (f.h_code.value != f.code.value) {
			alert('Vui long nhap day so ma ban nhin thay');
			f.code.focus();
			return false;
		}
	furl="f_email,y_email,content";
	fur2 = f_email+','+y_email+','+content;
	sendReq('ajax/_tellfriend.php',furl,fur2,'ext_tellfriend');
	return false;
}

function song_details (id) {
	showhide('ext_details');
	furl = 'act:s_details|s_id:'+id;
	sendReq('index.php','vnTRUST',furl,'ext_details');
}