This is code:
$.post(
                aHost + '/sad_ajax.php',
                  {
                          action: "chat",
                          username: user,
                          content: content_chat
                  }
                ,
                function (data) {
                        $("#content_chat").html(data);
                }
        );
it's work well on some hosting but some hoting it's doesn't work. this
is example http://changtraingheo.byethost22.com , you can use FireBug
to check it, On the server, data updated success, but it not update
content in DIV id="content_chat" . I try replace this code become
another script, it work well, this is code i changed already.

function getDataChat() {
        xmlhttpPost(aHost + 'sad_ajax.php');
}
function xmlhttpPost(strURL) {
    var xmlHttpReq = false;
    var self = this;
    // Mozilla/Safari
    if (window.XMLHttpRequest) {
        self.xmlHttpReq = new XMLHttpRequest();
    }
    // IE
    else if (window.ActiveXObject) {
        self.xmlHttpReq = new ActiveXObject("Microsoft.XMLHTTP");
    }
    self.xmlHttpReq.open('POST', strURL, true);
    self.xmlHttpReq.setRequestHeader('Content-Type', 'application/x-
www-form-urlencoded');
    self.xmlHttpReq.onreadystatechange = function() {
        if (self.xmlHttpReq.readyState == 4) {
            updatepage(self.xmlHttpReq.responseText);
        }
    }
    self.xmlHttpReq.send(getquerystring());
}

function getquerystring() {
        var user = document.getElementById('user').value;
        var content = document.getElementById('content').value;
    qstr = 'action=chat&username='+escape(user)+'&content='+escape
(content) ;
    return qstr;
}

function updatepage(str){
    document.getElementById("content_chat").innerHTML = str;
}

Call function getDataChat first.

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