var postduplicate="Ban phai cho 20 phut de dang lai ban tin nay";
var messerrsercurty='Nhap sai ma an toan -> la 5 ky tu trong o mau xanh';
var postOk = 'Tin cua ban da duoc dang';
var messFullName = 'Vui long nhap ho va ten';
var messEmail = 'Vui long nhap dia chi email';
var messBody = 'Vui long nhap noi dung';
var messFullNameSender = 'Vui long nhap ten nguoi goi';
var messEmailSender = 'Vui long nhap email nguoi goi';
var messFullNameReceiver = 'Vui long nhap ten nguoi nhan';
var messEmailReceiver = 'Vui long nhap email nguoi nhan';
var messTelephone = 'Vui long nhap so dien thoai';
var messSex = 'Vui long chon gioi tinh';
var messregerr1 = 'Email nay da co nguoi dang ky!Sua thanh email khac!Chua dang ky duoc\nHoac dung chuc nang quen mat khau de lay mat khau moi';
var messregerrfoget='Khong tim thay email trong du lieu cua chung toi!\nChua gui duoc mat khau';
var postOkpicErr='Tin cua ban da duoc dang. Nhung hinh anh chua dua len.\n Xem them huong dan de dua hinh vao, (?)';
var messchangememerr='Khong doi duoc thong tin thanh vien.';
var messchangememok='Doi thong tin thanh vien thanh cong.';
var passchangeok='Mat khau da doi thanh cong';
var passchangeerr='Mat khau khong doi duoc';
var messUserpay='Nhap danh gia, nhan xet, tra gia .. cua ban';
var messmaillhok='Da gui thong tin cua ban den nguoi dang tin, Cho ho tra loi ban';


function checkChangePassword(f) {
	newPassword1 = f.new_password1.value;
	if(newPassword1 == '') {
		alert('Vui long nhap mat khau moi');
		f.new_password1.focus();
		return false;
	}
	newPassword2 = f.new_password2.value;
	if (newPassword2 != newPassword1) {
		alert('Nhap lai mat khau moi khong dung');
		f.new_password2.focus();
		return false;
	}
}

function checkForm(f) {
	var user_email = f.user_email.value;
	var err=''
	if (Trim(user_email) == ''){
		err += messEmailInvalid;
		alert(err);
		f.user_email.focus();
		return false;
	}
	if (user_email.indexOf('@') <= 0 || user_email.indexOf('@') == user_email.length -1){
		err += messEmailInvalid;
	} else {
		var substr = user_email.substring(user_email.indexOf('@'),user_email.length);
		if (user_email.indexOf('.') <= 0) {
			err += messEmailInvalid;
		}
	}
	if (err != '') {
		alert(err);
		f.user_email.focus();
		return false;
	}
	var pass = f.user_password.value;
	if (Trim(pass) == '') {
		alert(messPassword);
		f.user_password.focus();
		return false;
	}
	return true;
}


function checkEmail(str){
	var textValue = str.value;
	var err='';
	if (Trim(textValue) == ''){
		err += messEmailInvalid;
		alert(err);
		str.focus();
		return false;
	}
	if (textValue.indexOf('@') <= 0 || textValue.indexOf('@') == textValue.length -1){
		err += messEmailInvalid;		
	} else {
		var substr = textValue.substring(textValue.indexOf('@'),textValue.length);
		if (textValue.indexOf('.') <= 0) {
			err += messEmailInvalid;
		}
	}
	if (err != '') { 
		alert(err); 
		str.focus();
		return false;
	}
	return true;
}


/* IE and NS6+ */
/* begin no click right */
function clickIE() {
	if (document.all) {
		return false;
	}
}
function clickNS(e) {
	if (document.layers||(document.getElementById&&!document.all)) {
		if (e.which==2||e.which==3) {
			return false;
		}
	}
}

/*****************************/

function checkVote(f,num) {
	var len = f.vote.length;
	var checked = false;
	w = 360;
	h = 252;
	var left = (screen.availWidth/2) - (w/2);
	var top = (screen.availHeight/2) - (h/2);

	if(num == '1') {
		window.open('index.php?action=thamdo','vote','width='+w+',height='+h+',scrollbars=0,status=0, left='+left+', top='+top)
		return true;
		
	} else {
		for (var i = 0; i< len; i++) {
			if (f.vote[i].checked==true){
				window.open('index.php?action=thamdo&vote=' + f.vote[i].value,'vote','width='+w+',height='+h+',left='+left+',top='+top);
				return true;
			}
		}
	}
	alert('Chon muc ban quan tam nhat');
	f.vote.focus;
	return false;
}


/*
==================================================================
LTrim(string) : Returns a copy of a string without leading spaces.
==================================================================
*/
function LTrim(str)
/*
PURPOSE: Remove leading blanks from our string.
IN: str - the string we want to LTrim
*/
{
   var whitespace = new String(' \t\n\r');

   var s = new String(str);

   if (whitespace.indexOf(s.charAt(0)) != -1) {
      // We have a string with leading blank(s)...

      var j=0, i = s.length;

      // Iterate from the far left of string until we
      // don't have any more whitespace...
      while (j < i && whitespace.indexOf(s.charAt(j)) != -1)
         j++;

      // Get the substring from the first non-whitespace
      // character to the end of the string...
      s = s.substring(j, i);
   }
   return s;
}

function RTrim(str)

{

   var whitespace = new String(' \t\n\r');

   var s = new String(str);

   if (whitespace.indexOf(s.charAt(s.length-1)) != -1) {
      // We have a string with trailing blank(s)...

      var i = s.length - 1;       // Get length of string

      // Iterate from the far right of string until we
      // don't have any more whitespace...
      while (i >= 0 && whitespace.indexOf(s.charAt(i)) != -1)
         i--;

      s = s.substring(0, i+1);
   }

   return s;
}

function Trim(str)
{
   return RTrim(LTrim(str));
}

function checkMailMess(f) {
	var body = f.txt_mail_mess.value;
	if (Trim(body) == '') {
		alert(messBody);
		f.txt_mail_mess.focus();
		return false;
	}
	return true;
}
function newwindow1(strhref,w,h){
	var xwidth = w;
	var xheight = h;
	var left = (screen.availWidth - xwidth) / 2
	var top = (screen.availHeight - xheight) / 2
	window.open(strhref,'','resizable=yes,scrollbars=yes,directories=no,width='+xwidth+',height='+xheight+', menubar=no,toolbar=no, left='+left+', top='+top)
}


function clickHelpImg() {
	mess = '--------- HUONG DAN DUA HINH VAO ---------\n\n+ Hinh dang *.gif, *.jpg\n+ Kich thuoc <= 400 x 1500 pixels doi voi thanh vien VIP \n+ Kich thuoc <= 300 x 300 pixels doi voithanh vien thuong \n+ Dung luong nho hon 50 Kb';
	alert(mess);
}




function clickVipHelp() {
	mess = '----- HUONG DAN CAP NHAT TIN VIP -------\n - Neu da dang tin va mua VIP roi ma van chua len dau nhu la VIP thi ban phai chon vao check box va cap nhat VIP\n+ Chi duoc chon dung so tin VIP minh mua -> Sau khi chon vao check box sau so thu tu thi chon Cap nhat VIP\n+ Neu muon tin vip dua len dau tien co 2 cach : \n  + 1 la sua lai tin vip \n + 2 la chon lai tin vip khac va chon Cap nhat VIP ';
alert(mess);
}