function sendguest(divId)
{

if(trim(document.getElementById("plnr").value)=="")
{
alert("留言信息不能为空!");
}
else
{
xmlhttp_request=getXMLRequester();

xmlhttp_request.onreadystatechange = function() 
{
if (xmlhttp_request.readyState == 4)
{
if (xmlhttp_request.status == 200)
{

//var stateD=document.getElementById(divId);
//stateD.style.display="block";
document.getElementById(divId).innerHTML=xmlhttp_request.responseText;

}
else
{
//alert("请求页面错误");
document.getElementById(divId).innerHTML="暂无信息！";
}
}
else
{
	var stateD=document.getElementById(divId);
	stateD.style.display="block";
	stateD.innerHTML="页面加载中...";
}
}

var url="saveguest.aspx";

var poststr="text="+document.getElementById("plnr").value;
xmlhttp_request.open('POST', url, true); 
xmlhttp_request.SetRequestHeader("Content-Type","application/x-www-form-urlencoded"); 
xmlhttp_request.send(poststr);
}
}