// ==================================================================
// Tat ca cac JS  vtcnews 
// ==================================================================
var pageURL = 'http://vtc.vn/';
function SearchOnFocus(field) {
    if (field.value == 'Từ khóa tìm kiếm') { field.value = ''; }
}

function SearchOnBlur(field) {
    if (field.value == '') { field.value = 'Từ khóa tìm kiếm'; }
}

function keyCatch(e, url, txt) {
    if (window.event && window.event.keyCode == "13")
        goSearch(url, txt);
    else if (e.which) {
        if (e.which == 13)
            goSearch(url, txt);
    }
}
function goSearch(url, txt) {
    var textsearch = document.getElementById(txt).value;
    window.location.href = url + textsearch + '/index.htm';
}

function writeLayer(layerID, txt) {
    if (document.getElementById) {
        document.getElementById(layerID).innerHTML = txt;
    } else if (document.all) {
        document.all[layerID].innerHTML = txt;
    } else if (document.layers) {
        with (document.layers[layerID].document) {
            open();
            write(txt);
            close();
        }
    }
}

function getLayer(layerID) {
    if (document.getElementById) {
        return document.getElementById(layerID).innerHTML;
    } else if (document.all) {
        return document.all[layerID].innerHTML = txt;
    }
}

function makeBigerFont(layerID) {
    var tmpStr = "";
    tmpStr = getLayer(layerID);
    tmpStr = tmpStr.replace(/size=\"2\"/g, "size=3");
    tmpStr = tmpStr.replace(/size=2/g, "size=3");
    tmpStr = tmpStr.replace(/FONT-SIZE: 10pt/g, "FONT-SIZE: 12pt");
    tmpStr = tmpStr.replace(/font-size: 10pt/g, "font-size: 12pt");
    writeLayer(layerID, tmpStr);
    document.getElementById(layerID).style.fontSize = "12pt";
}

function setBigerFont(layerID) {
    makeBigerFont(layerID);
    createCookie("fontSize", 3, 30);
}
function makeSmallerFont(layerID) {
    var tmpStr = "";
    tmpStr = getLayer(layerID);
    tmpStr = tmpStr.replace(/size=\"3\"/g, "size=2");
    tmpStr = tmpStr.replace(/size=3/g, "size=2");
    tmpStr = tmpStr.replace(/FONT-SIZE: 12pt/g, "FONT-SIZE: 10pt");
    tmpStr = tmpStr.replace(/font-size: 12pt/g, "font-size: 10pt");
    writeLayer(layerID, tmpStr);
    document.getElementById(layerID).style.fontSize = "10pt";
}
function setSmallerFont(layerID) {
    makeSmallerFont(layerID);
    createCookie("fontSize", 2, 30);
}

function createCookie(name, value, days) {
    if (days) {
        var date = new Date();
        date.setTime(date.getTime() + (days * 24 * 60 * 60 * 1000));
        var expires = "; expires=" + date.toGMTString();
    }
    else var expires = "";
    document.cookie = name + "=" + value + expires + ";domain=.vtc.vn; path=/";
}

function readCookie(name) {
    var nameEQ = name + "=";
    var ca = document.cookie.split(';');
    for (var i = 0; i < ca.length; i++) {
        var c = ca[i];
        while (c.charAt(0) == ' ') c = c.substring(1, c.length);
        if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length, c.length);
    }
    return null;
}

function eraseCookie(name) {
    createCookie(name, "", -1);
}

//adv
function setAdv(imgObj, linkObj, imgAdv, linkAdv) {
    document.getElementById(imgObj).src = imgAdv;
    document.getElementById(linkObj).href = linkAdv;
}

function shareAdv(imgObj, linkObj, arrayAdv, maxStep, curr) {
    if (curr == maxStep) { curr = 0; }
    curr = curr + 1;
    setAdv(imgObj, linkObj, arrayAdv[curr][1], arrayAdv[curr][0]);

    //setTimeout("shareAdv('"+imgObj+"','"+linkObj+"',arrayAdv,maxStep,curr)",3600);
}

// Load all cates for HomePage
function loadCateHomePage(cateHomeUrl) {
    $.ajax({
        url: cateHomeUrl,
        type: 'GET',
        cache: false,
        dataType: 'xml',
        timeout: 5000,
        success: function(xml) {
            $(xml).find('Table').each(function() {
                var cateName = 'cateXML';
                var cateID = $(this).find('CateID').text();
                cateName += cateID;

                var cateTitle = $(this).find('CateTile').text();
                var cateLink = $(this).find('CateLink').text();

                var contentCate;
                contentCate = '<div class="cateTitleDiv"><a href="' + cateLink + '" class="titlebai">' + cateTitle + '</a></div>'

                // Sub cate
                var subCateContent = '<div class="sup_mnnho cateSub">';
                var lenSubCates = $(this).find('ChildCate').size();
                var index = 0;

                $(this).find('ChildCate').each(function() {
                    index++;
                    var subCateName = $(this).find('ChildCateTitle').text();
                    var subCateLink = $(this).find('ChildCateLink').text();

                    subCateContent += '<a href="' + subCateLink + '" class="sup_mnnho">' + subCateName + '</a>';
                    if (index < lenSubCates) {
                        subCateContent += '&nbsp;|&nbsp;';
                    }
                });

                subCateContent += '</div>';

                // Add subcates content
                contentCate += subCateContent;

                // Top news of Cate
                var topCateContent = '<div>';

                var imgUrl = $(this).find('ImageUrl').text();
                var articleLink = $(this).find('Link').text();
                var articleTitle = $(this).find('Title').text();
                var articleMobileContent = $(this).find('MobileContent').text();

                if ($.trim(imgUrl).length > 0) {
                    if ((cateID == 432) || (cateID == 433)) {
                        topCateContent += '<a href="' + articleLink + '"><img class="cateImgTT24h" src="' + imgUrl + '"></a>';
                    }
                    else {
                        topCateContent += '<a href="' + articleLink + '"><img class="cateImg" src="' + imgUrl + '"></a>';
                    }
                }
                topCateContent += '<p style="margin-bottom:10px;margin-top:0px;"><a href="' + articleLink + '" class="title_nho">' + articleTitle + '</a></p>';
                topCateContent += '<span class="text">' + articleMobileContent + '</span>';
                topCateContent += '</div>';

                // Add top news of Cate
                contentCate += topCateContent;

                // Other news of Cate
                var otherNewsContent = '<div style="width:100%; float:left; padding-top:5px;">';

                $(this).find('OtherNew').each(function() {
                    var otherID = $(this).find('OtherID').text();
                    var otherLink = $(this).find('OtherLink').text();
                    var otherTitle = $(this).find('OtherTitle').text();
                    var otherImgUrl = $(this).find('OtherImageUrl').text();
                    var otherLead = $(this).find('OtherLead').text();

                    otherNewsContent += '<div class="cateOthers"><a id="#cate' + otherID + '" href="' + otherLink + '" class="dadua">' + otherTitle + '</a></div>';
                    otherNewsContent += '<div id="cate' + otherID + '" style="display:none;"><img src="' + otherImgUrl + '" style="float:left;width:100px; border:1px solid #000; margin-right:5px;"/>' + otherLead + '</div>';
                });
                otherNewsContent += '</div>';

                // Add other news
                contentCate += otherNewsContent;

                // Add all of content
                $('#' + cateName).append(contentCate);
            }); //close each(
        }
    });
}

// Load all cates for HomePage
function loadGameCateHomePage(cateHomeUrl) {
    $.ajax({
        url: cateHomeUrl,
        type: 'GET',
        cache: false,
        dataType: 'xml',
        timeout: 5000,
        success: function(xml) {
            $(xml).find('Table').each(function() {
                var cateName = 'cateXML';
                var cateID = $(this).find('CateID').text();
                cateName += cateID;

                var cateTitle = $(this).find('CateTile').text();
                var cateLink = $(this).find('CateLink').text();

                var contentCate;


                contentCate = '<div style="clear: both; background-color: rgb(33, 32, 33); padding-bottom: 10px;"><div style="background:url(/images/game/bg_cate.jpg) no-repeat; width:149px;height:29px; float:left; padding-bottom:10px;"><div class="textcate textcate_pad"><a href="' + cateLink + '">' + cateTitle + '</a></div></div>'

                // Sub cate
                var subCateContent = '<div class="bgSub"></div><a href="' + cateLink + '"><img src="/images/game/xemtiep.jpg" style="float:right;"/></a>';
                //                 var lenSubCates = $(this).find('ChildCate').size();
                //                 var index = 0;
                //                 
                //                 $(this).find('ChildCate').each(function(){
                //                    index ++;
                //                    var subCateName = $(this).find('ChildCateTitle').text();
                //                    var subCateLink = $(this).find('ChildCateLink').text();
                //                    
                //                    subCateContent += '<a href="' + subCateLink + '">' + subCateName + '</a>';
                //                    if (index < lenSubCates)
                //                    {
                //                        subCateContent += '&nbsp;|&nbsp;';
                //                    }
                //                 });

                //                 subCateContent += '</div>';

                // Add subcates content
                contentCate += subCateContent;

                // Top news of Cate
                var topCateContent = '';

                var imgUrl = $(this).find('ImageUrl').text();
                var articleLink = $(this).find('Link').text();
                var articleTitle = $(this).find('Title').text();
                var articleMobileContent = $(this).find('MobileContent').text();

                topCateContent += '<div style="padding:0px 12px; clear:both;">';
                topCateContent += '<a href="' + articleLink + '"><img src="' + imgUrl + '" class="imgtinhot" height="100px" style="float:left;"></a>';
                topCateContent += '<div class="textxanh" style="float:left; margin-left:20px; width:500px;">';
                topCateContent += '<a href="' + articleLink + '">' + articleTitle + '</a></p>';
                topCateContent += '<p class="textnd">' + articleMobileContent + '</p>';
                topCateContent += '</div></div>';

                // Add top news of Cate
                contentCate += topCateContent;

                // Other news of Cate
                var otherNewsContent = '<div style="clear:both;"><div  class="tinkhac"><ul>';

                $(this).find('OtherNew').each(function() {
                    var otherID = $(this).find('OtherID').text();
                    var otherLink = $(this).find('OtherLink').text();
                    var otherTitle = $(this).find('OtherTitle').text();
                    var otherImgUrl = $(this).find('OtherImageUrl').text();
                    var otherLead = $(this).find('OtherLead').text();

                    otherNewsContent += '<li><a href="' + otherLink + '">' + otherTitle + '</a></li>';
                });
                otherNewsContent += '</ul></div></div>';

                // Add other news
                contentCate += otherNewsContent;


                // Add all of content
                $('#' + cateName).append(contentCate);
            }); //close each(
        }
    });
}

//load Ajax
function loadTop3() {
    $.ajax({
        url: '/XMLFile/focusnews.xml',
        type: 'GET',
        dataType: 'xml',
        cache: false,
        timeout: 3000,
        success: function(xml) {
            var i = 0;
            $(xml).find('Table').each(function() {
                i++;
                // Chi hien thi 3 NewsTop dau
                if (i < 4) {
                    var link = $(this).find('Link').text();
                    var lead = $(this).find('Lead').text();
                    var title = $(this).find('Title').text();
                    var imageUrl = $(this).find('ImageUrl').text();

                    var content = '';
                    content += '<div style="float:left; width:100%; margin-bottom: 5px;" align="left"><a href="' + link + '" class="title_nho_top3">' + title + '</a></div>';
                    content += '<div style="float:left; width: 100%;">';
                    content += '<div style="float:left; width:62%;" class="text">' + lead + '</div>';
                    content += '<div style="float:right; width:34%;"><a href="' + link + '"><img src="' + imageUrl + '" class="imgTop4"></a></div>';
                    content += '</div>';

                    $('<div style="width: 100%;" align="left"></div>')
                         .html(content)
                         .appendTo('#top3');

                    $('<div style="float:left;width:100%;"></div>')
                        .html('<hr size="1" color="#cccccc"/>')
                        .appendTo('#top3');
                }
            }); //close each(
        }
    });
}

function loadTop4() {
    $.ajax({
        url: '/XMLFile/focusnews.xml',
        type: 'GET',
        dataType: 'xml',
        cache: false,
        timeout: 3000,
        success: function(xml) {
            $(xml).find('Table').each(function() {
                var link = $(this).find('Link').text();
                var lead = $(this).find('Lead').text();
                var title = $(this).find('Title').text();
                var imageUrl = $(this).find('ImageUrl').text();

                var content = '';
                content += '<div style="float:left; width:100%; margin-bottom: 5px;" align="left"><a href="' + link + '" class="title_nho">' + title + '</a></div>';
                content += '<div style="float:left; width: 100%;">';
                content += '<div style="float:left; width:62%;" class="text">' + lead + '</div>';
                content += '<div style="float:right; width:34%;"><a href="' + link + '"><img src="' + imageUrl + '" class="imgTop4"></a></div>';
                content += '</div>';

                $('<div style="width: 100%;" align="left"></div>')
                     .html(content)
                     .appendTo('#top4');

                $('<div style="float:left;width:100%;"></div>')
                    .html('<hr size="1" color="#cccccc"/>')
                    .appendTo('#top4');

            }); //close each(
        }
    });
}

function loadHotNews() {
    $.ajax({
        url: '/XMLFile/hotnews.xml',
        type: 'GET',
        cache: false,
        dataType: 'xml',
        timeout: 3000,
        success: function(xml) {
            $(xml).find('Table').each(function() {
                var link = $(this).find('Link').text();
                var lead = $(this).find('Lead').text();
                var title = $(this).find('Title').text();

                $('<li></li>')
                     .html('<a href="' + link + '" title="' + lead + '" class="tinnong">' + title + '</a>')
                     .appendTo('.listHotNew ul');
            }); //close each(
        }
    });
}

function loadLeftAdv() {
    $.ajax({
        url: '/XMLFile/advleft.xml',
        type: 'GET',
        cache: false,
        dataType: 'xml',
        timeout: 3000,
        success: function(xml) {
            $(xml).find('Table').each(function() {
                var advUrl = $(this).find('AdvUrl').text();
                var logoFileName = $(this).find('LogoFileName').text();

                $('<li></li>')
                     .html('<a href="' + advUrl + '" target="_blank"><img src="' + logoFileName + '" width="139" class="leftAdvImg"></a>')
                     .appendTo('#AdvLeft div ul');
            }); //close each(
        }
    });
}

function loadRightAdv() {
    $.ajax({
        url: '/XMLFile/advright.xml',
        type: 'GET',
        cache: false,
        dataType: 'xml',
        timeout: 3000,
        success: function(xml) {
            $(xml).find('Table').each(function() {
                var advUrl = $(this).find('AdvUrl').text();
                var logoFileName = $(this).find('LogoFileName').text();

                $('<li></li>')
                     .html('<a href="' + advUrl + '" target="_blank"><img src="' + logoFileName + '" width="247" class="rightAdvImg"></a>')
                     .appendTo('#AdvRight div ul');
            }); //close each(
        }
    });
}


function loadRightAdvTop() {
    $.ajax({
        url: '/XMLFile/advrighttop.xml',
        type: 'GET',
        cache: false,
        dataType: 'xml',
        timeout: 3000,
        success: function(xml) {
            $(xml).find('Table').each(function() {
                var advUrl = $(this).find('AdvUrl').text();
                var logoFileName = $(this).find('LogoFileName').text();

                $('<div style="padding-bottom:4px" valign="top"></div>')
                     .html('<a href="' + advUrl + '" target="_blank"><img src="' + logoFileName + '" width="247" class="rightAdvImg"></a>')
                     .appendTo('#AdvRightTop');
            }); //close each(
        }
    });
}

function loadSideAdv(loader, xmlUrl, imgWidth) {
    $.ajax({
        url: xmlUrl,
        type: 'GET',
        cache: false,
        dataType: 'xml',
        timeout: 3000,
        success: function(xml) {
            $(xml).find('Table').each(function() {
                var advUrl = $(this).find('AdvUrl').text();
                var logoFileName = $(this).find('LogoFileName').text();

                $('<li></li>')
                     .html('<a href="' + advUrl + '" target="_blank"><img src="' + logoFileName + '" width="' + imgWidth + '" class="rightAdvImg"></a>')
                     .appendTo(loader);
            }); //close each(
        }
    });
}

function loadMainAdv(xmlUrl, divContent) {

    $.ajax({
        url: xmlUrl,
        type: 'GET',
        cache: false,
        dataType: 'xml',
        timeout: 3000,
        success: function(xml) {
            $(xml).find('Table').each(function() {
                var advUrl = $(this).find('AdvUrl').text();
                var logoFileName = $(this).find('LogoFileName').text();
                var advType = $(this).find('advType').text();
                if (advType == 'image') {
                    $('<div></div>')
                     .html('<a href="' + advUrl + '" target="_blank"><img src="' + logoFileName + '" width="710" height="75" class="rightAdvImg"></a>')
                     .appendTo(divContent);
                }
                else {
                    var fWidth = $(this).find('advWidth').text();
                    var fHeight = $(this).find('advHeight').text();
                    $('<div></div>')
                     .html('<a href="' + advUrl + '" target="_blank"><embed src="' + advUrl + '" pluginspage="http://www.macromedia.com/go/getflashplayer" type="application/x-shockwave-flash" width="' + fWidth + '" height="' + fHeight + '" quality="High" wmode="transparent" /></a>')
                     .appendTo(divContent);
                }
            }); //close each(
        }
    });
}

function loadTopMainAdv(xmlUrl, divContent) {
    $.ajax({
        url: xmlUrl,
        type: 'GET',
        cache: false,
        dataType: 'xml',
        timeout: 3000,
        success: function(xml) {
            var index = 0;
            var divTopContentIndex;

            $(xml).find('Table').each(function() {
                index += 1;
                divTopContentIndex = divContent + index.toString();

                var advUrl = $(this).find('AdvUrl').text();
                var logoFileName = $(this).find('LogoFileName').text();

                $('<div></div>')
                     .html('<a href="' + advUrl + '" target="_blank"><img src="' + logoFileName + '" width="230" height="60" class="rightAdvImg"></a>')
                     .appendTo(divTopContentIndex);
            }); //close each(
        }
    });
}

function loadAdv(xmlUrl, divContent, imgWidth, imgHeight) {
    $.ajax({
        url: xmlUrl,
        type: 'GET',
        cache: false,
        dataType: 'xml',
        timeout: 3000,
        success: function(xml) {
            $(xml).find('Table').each(function() {
                var advUrl = $(this).find('AdvUrl').text();
                var logoFileName = $(this).find('LogoFileName').text();

                $('<div></div>')
                     .html('<a href="' + advUrl + '" target="_blank"><img src="' + logoFileName + '" width="' + imgWidth + '" height="' + imgHeight + '"></a>')
                     .appendTo(divContent);
            }); //close each(
        }
    });
}

function moveDivMain(mover, num, moverHeigh, moveTimer) {
    $(mover).animate({
        top: '+=' + moverHeigh
    }, moveTimer);
    if ($(mover).position().top == -moverHeigh * (num - 1)) {
        $(mover).animate({
            top: '+=' + moverHeigh
        }, moveTimer);
        $(mover).css("top", -moverHeigh * (2 * num - 1) + "px");
        $(mover).stop();
    }
}

function animateDivMain(mover, xmlUrl, moverHeight, moveTime, totalDelay) {
    var num = $(mover + " div").length;
    if (num > 1) {
        loadMainAdv(xmlUrl, mover);
        $(mover).css("top", -moverHeight * (2 * num - 1) + "px");
        setInterval("moveDivMain('" + mover + "'," + num + "," + moverHeight + "," + moveTime + ")", totalDelay);
    }
}

function animateDiv(mover, xmlUrl, moverHeight, moverWidth, moveTime, totalDelay) {
    var num = $(mover + " div").length;
    if (num > 1) {
        loadAdv(xmlUrl, mover, moverWidth, moverHeight);
        $(mover).css("top", -moverHeight * (2 * num - 1) + "px");
        setInterval("moveDivMain('" + mover + "'," + num + "," + moverHeight + "," + moveTime + ")", totalDelay);
    }
}

function slideShowPopup(catname,articleid, currPage) {  

    var popW = 800, popH = 800;

    var leftPos = (window.screen.width - popW) / 2, topPos = (window.screen.height - popH) / 2;
    window.open(catname + '/slide-show/' + articleid + '/' + currPage + '/index.htm', 'slideshowpopup', 'width=' + popW + ',height=' + popH + ',top=' + topPos + ',left=' + leftPos + ',toolbar=no');
}

function showDialog(vLink, vWidth, vHeight) {
    return showWindow(vLink, false, true, true, false, false, false, false, true, true, vWidth, vHeight, 0, 0);
}
function showModalDialog(vLink, vWidth, vHeight) {
    return showWindow(vLink, false, false, false, false, false, false, false, true, true, vWidth, vHeight, 0, 0);
}

function showWindow(vLink, vStatus, vResizeable, vScrollbars, vMenubar, vToolbar, vLocation, vFullscreen, vTitlebar, vCentered, vWidth, vHeight, vTop, vLeft) {
    var sLink = (typeof (vLink.href) == 'undefined') ? vLink : vLink.href;

    winDef = '';
    winDef = winDef.concat('status=').concat((vStatus) ? 'yes' : 'no').concat(',');
    winDef = winDef.concat('resizable=').concat((vResizeable) ? 'yes' : 'no').concat(',');
    winDef = winDef.concat('menubar=').concat((vMenubar) ? 'yes' : 'no').concat(',');
    winDef = winDef.concat('scrollbars=').concat((vScrollbars) ? 'yes' : 'no').concat(',');
    winDef = winDef.concat('toolbar=').concat((vToolbar) ? 'yes' : 'no').concat(',');
    winDef = winDef.concat('location=').concat((vLocation) ? 'yes' : 'no').concat(',');
    winDef = winDef.concat('fullscreen=').concat((vFullscreen) ? 'yes' : 'no').concat(',');
    winDef = winDef.concat('titlebar=').concat((vTitlebar) ? 'yes' : 'no').concat(',');
    winDef = winDef.concat('height=').concat(vHeight).concat(',');
    winDef = winDef.concat('width=').concat(vWidth).concat(',');

    if (vCentered) {
        winDef = winDef.concat('top=').concat((screen.height - vHeight) / 2).concat(',');
        winDef = winDef.concat('left=').concat((screen.width - vWidth) / 2);
    }
    else {
        winDef = winDef.concat('top=').concat(vTop).concat(',');
        winDef = winDef.concat('left=').concat(vLeft);
    }

    open(sLink, '_blank', winDef);

    if (typeof (vLink.href) != 'undefined') {
        return false;
    }
}
function share_twitter() { u = location.href; t = document.title; window.open("http://twitter.com/home?status=" + encodeURIComponent(u)); }
function share_facebook() { u = location.href; t = document.title; window.open("http://www.facebook.com/share.php?u=" + encodeURIComponent(u) + "&t=" + encodeURIComponent(t)); }
function share_google() { u = location.href; t = document.title; window.open("http://www.google.com/bookmarks/mark?op=edit&bkmk=" + encodeURIComponent(u) + "&title=" + t + "&annotation=" + t); }
function share_buzz() { u = location.href; t = document.title; window.open("http://buzz.yahoo.com/buzz?publisherurn=DanTri&targetUrl=" + encodeURIComponent(u)); }

function InputFocus(textdefault, control) {
    text = control.value;
    if (text == textdefault) control.value = "";
}
function InputBlur(textdefault, control) {
    text = control.value;
    if (text == "") control.value = textdefault;
}

function showhideComment() {
    $('#boxComment').toggle();
}

function clearit() {
    document.getElementById('ctl00_ctl00_ContentPlaceHolder1_ContentPlaceHolder1_txtTitle').value = "Tiêu đề";
    document.getElementById('ctl00_ctl00_ContentPlaceHolder1_ContentPlaceHolder1_txtName').value = "Họ tên";
    document.getElementById('ctl00_ctl00_ContentPlaceHolder1_ContentPlaceHolder1_txtEmail').value = "Email";
    document.getElementById('ctl00_ctl00_ContentPlaceHolder1_ContentPlaceHolder1_txtAddress').value = "Địa chỉ";
    document.getElementById('ctl00_ctl00_ContentPlaceHolder1_ContentPlaceHolder1_txtPhone').value = "Điện thoại";
    document.getElementById('ctl00_ctl00_ContentPlaceHolder1_ContentPlaceHolder1_txtContent').value = "Nội dung";
}

function validate() {
    var txt = document.getElementById('ctl00_ctl00_ContentPlaceHolder1_ContentPlaceHolder1_txtTitle');
    var i = 0;

    if (txt.value == '' || txt.value == 'Tiêu đề') {
        alert("Bạn chưa nhập tiêu đề");
        return false;
    }

    txt = document.getElementById('ctl00_ctl00_ContentPlaceHolder1_ContentPlaceHolder1_txtName');
    if (txt.value == '' || txt.value == 'Họ tên') {
        alert("Bạn chưa nhập họ tên");
        return false;
    }

    txt = document.getElementById('ctl00_ctl00_ContentPlaceHolder1_ContentPlaceHolder1_txtEmail');
    if (txt.value != '' && txt.value != 'Email') {
        if (!echeck(txt.value)) {
            alert("Email bạn nhập chưa chính xác");
            return false;
        }
    }

    txt = document.getElementById('ctl00_ctl00_ContentPlaceHolder1_ContentPlaceHolder1_txtContent');
    if (txt.value == '' || txt.value == 'Nội dung') {
        alert("Bạn chưa nhập nội dung");
        return false;
    }
        return true;
   
}
function echeck(str) {

    var at = "@"
    var dot = "."
    var lat = str.indexOf(at)
    var lstr = str.length
    var ldot = str.indexOf(dot)
    if (str.indexOf(at) == -1) {
        //		   alert("Invalid E-mail ID")
        return false
    }

    if (str.indexOf(at) == -1 || str.indexOf(at) == 0 || str.indexOf(at) == lstr) {
        //		   alert("Invalid E-mail ID")
        return false
    }

    if (str.indexOf(dot) == -1 || str.indexOf(dot) == 0 || str.indexOf(dot) == lstr) {
        //		    alert("Invalid E-mail ID")
        return false
    }

    if (str.indexOf(at, (lat + 1)) != -1) {
        //		    alert("Invalid E-mail ID")
        return false
    }

    if (str.substring(lat - 1, lat) == dot || str.substring(lat + 1, lat + 2) == dot) {
        //		    alert("Invalid E-mail ID")
        return false
    }

    if (str.indexOf(dot, (lat + 2)) == -1) {
        //		    alert("Invalid E-mail ID")
        return false
    }

    if (str.indexOf(" ") != -1) {
        //		    alert("Invalid E-mail ID")
        return false
    }

    return true
}