var xmlHttp;
var id
function GetXmlHttpObject()
{
 var objXMLHttp=null;
 if(window.XMLHttpRequest)
 {
  objXMLHttp=new XMLHttpRequest();
 }
 else if(window.ActiveXObject)
 {
  objXMLHttp=new ActiveXObject("Microsoft.XMLHTTP");
 }
 return objXMLHttp;
}
//读取页面中部的数据
function Show_Ajax_Data(myurl,myid)
{
  id=myid;
  xmlHttp=GetXmlHttpObject();
  if(xmlHttp==null)
  {
   alert("浏览器不支持 AJAX技术,请使用IE浏览器！订票电话：0871-8061111");
   return ;
  }
  var url=myurl;
  xmlHttp.onreadystatechange=Changed_data;
  xmlHttp.open("GET",url,true);
  xmlHttp.send(null);
}

function Changed_data()
{
 switch(xmlHttp.readyState)
 {
	case 0:
	window.status="Ajax未初始化... 服务电话：0871-8061111";
	document.getElementById("PleaseWaitData").innerHTML="<B>Ajax未初始化...<br>0871-8061111</B>";
	break;
	case 1:
	window.status="正在从服务器读取数据,请稍侯... 服务电话：0871-8061111"; 
	document.getElementById("PleaseWaitData").innerHTML="<B>正在读取数据,请稍侯...<br>0871-8061111</B>";
	do_totals1();
	break;
	case 2:
	window.status="数据已读取... 服务电话：0871-8061111"; 
	document.getElementById("PleaseWaitData").innerHTML="<B>数据已读取,请稍侯... <br>0871-8061111</B>";
	do_totals1();
	break;
	case 3:
	window.status="数据交互中... 服务电话：0871-8061111"; 
	document.getElementById("PleaseWaitData").innerHTML="<B>数据交互中,请稍侯... <br>0871-8061111</B>";
	do_totals1();
	break;
	case 4:
	window.status="昆明在文航空 订全国3-9折去程、回程、往返程、联程及异地出港机票 电话：0871-8061111"; 
	if (xmlHttp.status == 200) 
    {

        do_totals2();
	    document.getElementById(id).innerHTML=unescape(xmlHttp.responseText);
    } 
    else 
    {
       document.getElementById("center_Data").innerHTML=""
	   window.status="您所请求的数据源有异常，请与技术人员联系。服务电话：0871-8061111";
	   document.getElementById("PleaseWaitData").innerHTML="<B>您所请求的数据源有异常<br>请与技术人员联系</B>";
	   do_totals1();
    }
	break;
  }
}

//========以下是用于pleasewaitScreen
function do_totals1()

		{

		document.all.pleasewaitScreen.style.pixelTop = (document.body.scrollTop +250);

		document.all.pleasewaitScreen.style.visibility="visible";

		//window.setTimeout('do_totals2()',1);

		}	

		

		function do_totals2()

		{

		//lengthy_calculation();

		document.all.pleasewaitScreen.style.visibility="hidden";

		}

		

		function lengthy_calculation()

		{

		var x,y

		

		for(x=0;x<1000000;x++)

			{

			y += (x * y) / (y - x);			

			}

		}
/////================pleasewaitScreen====end