var xmlHttp;
function createXMLHttpRequest() {
     if (window.XMLHttpRequest){               //FireFox
            xmlHttp = new XMLHttpRequest();
          }
     else if(window.ActiveXObject){
           try {
           xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");   //IE6
          }catch(e){
           try {
           xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");      //IE7
          }catch (e){
           alert('对不起，本页面只支持IE6,IE7,FireFox');
          }
      }
   }
}
function startRequest() {
    var title = document.getElementById("a1").value;  //留言人姓名
    var descn = document.getElementById("b1").value;  //留言内容
    var where = document.getElementById("where").value;
    if(title=='' || descn=='' || descn.length>210){
    	alert('姓名或留言内容不能为空!并且内容<200字!');
    	return false;
    }else{
        createXMLHttpRequest();
        xmlHttp.onreadystatechange = handleStateChange;
        var senddate="a1="+title+"&b1="+descn;
        xmlHttp.open("POST", where, true);
        xmlHttp.setRequestHeader("Content-Type","application/x-www-form-urlencoded;charset=UTF-8");   
        xmlHttp.send(senddate);
    }
}
function handleStateChange() {
    if(xmlHttp.readyState == 4) {
        if(xmlHttp.status == 200) {
            var result = xmlHttp.responseText;
            var msg = result.split("|");
            document.getElementById('mysubmit').disabled='true';        //提交按钮不可用了
            document.getElementById("mycomment").style.display='block';  //层显示
            document.getElementById("mytitle").innerHTML = msg[0];			
            document.getElementById("mydescn").innerHTML = msg[1];
            document.getElementById("msg").style.display="none";  //层释放
        }
    }
    else{
    	    document.getElementById("msg").innerHTML = "正在提交...";
    }
}