var xmlHttp;
            var id = 20456;
            function showUser(str)
            {
                xmlHttp = GetXmlHttpObject()
                if (xmlHttp == null)
                {
                    alert("Browser does not support HTTP Request");
                    return;
                }
                str = 20215;
                var url = "bbsAction.php?action=getBbs";
                url = url + "&q=" + str;
                url = url + "&sid=" + Math.random();
                //alert(url);
                xmlHttp.onreadystatechange = stateChanged;
                xmlHttp.open("GET", url, true);
                xmlHttp.send(null);
            }
            function stateChanged()
            {
                if (xmlHttp.readyState == 4 || xmlHttp.readyState == "complete")
                {
                    xmlDoc = xmlHttp.responseXML;
                    var id = xmlDoc.getElementsByTagName("id")[0].childNodes[0].nodeValue;//获取XML文档中的id节点的第一个子节点的值
                    //alert(id.length);
                    bbsid = id;
                    var content = xmlDoc.getElementsByTagName("title")[0].firstChild.nodeValue;//获取XML文档中的title节点的第一个子节点的值
                    var sendTime = xmlDoc.getElementsByTagName("sendTime")[0].firstChild.nodeValue; //获取XML文件中的time节点的第一个子节点的值
                    var remindMessage = new PopBubble(300, 200, " ", content, sendTime);
                    //alert(remindMessage);
                    remindMessage.box(null, null, null, screen.height - 30);    //设置弹出窗口的左边、右边、顶边和底边框的位置
                    remindMessage.speed = 10;       //设置窗口的弹出速度
                    remindMessage.step = 2;             //设置窗口的弹出步幅
                    //alert("12");
                    remindMessage.show();
                    //弹出窗口
                    PopBubble.prototype.oncommand = function() {
                        window.open("BbsServlet?action=getDetail&id=" + id, "", "width=513,height=567,scrollbars=1");
                        this.close = true;
                        this.hide();            //收缩窗口
                    }
                    /*
                     document.getElementById("id").innerHTML =
                     xmlDoc.getElementsByTagName("id")[0].childNodes[0].nodeValue;
                     document.getElementById("title").innerHTML =
                     xmlDoc.getElementsByTagName("title")[0].childNodes[0].nodeValue;
                     document.getElementById("content").innerHTML =
                     xmlDoc.getElementsByTagName("content")[0].childNodes[0].nodeValue;
                     document.getElementById("sendTime").innerHTML =
                     xmlDoc.getElementsByTagName("sendTime")[0].childNodes[0].nodeValue;
                     */
                }
            }
            function GetXmlHttpObject()
            {
                var objXMLHttp = null;
                if (window.XMLHttpRequest)
                {
                    objXMLHttp = new XMLHttpRequest();
                }
                else if (window.ActiveXObject)
                {
                    objXMLHttp = new ActiveXObject("Microsoft.XMLHTTP");
                }
                return objXMLHttp;
            }
            window.onload = function() {
                showUser(id);
                window.setInterval(showUser, 10000);
            }
        
    
    
        
    

bbsAction.php

';
while ($row = mysql_fetch_array($result)) {
    echo '';
    echo "" . $row['id'] . "";
    echo "";
    echo "" . $row['content'] . "";
    echo "" . $row['sendTime'] . "";
    echo '';
   // echo "" . $row['id'] . "";
        
        
}
echo "";
mysql_close($con);
?>