// JScript 文件
/**
* XMLHttpRequest Object Pool
*
* @author legend <legendsky@hotmail.com>
* @link http://www.ugia.cn/?p=85
* @Copyright www.ugia.cn
*/ 

var XMLHttp = {
_objPool: [],

_getInstance: function ()
{
	for (var i = 0; i < this._objPool.length; i ++)
	{
		if (this._objPool[i].readyState == 0 || this._objPool[i].readyState == 4)
		{
			return this._objPool[i];
		}
	}

	// IE5中不支持push方法
	this._objPool[this._objPool.length] = this._createObj();

	return this._objPool[this._objPool.length - 1];
},

_createObj: function ()
{
	if (window.XMLHttpRequest)
	{
		var objXMLHttp = new XMLHttpRequest();

	}
	else
	{
		var MSXML = ['MSXML2.XMLHTTP.5.0', 'MSXML2.XMLHTTP.4.0', 'MSXML2.XMLHTTP.3.0', 'MSXML2.XMLHTTP', 'Microsoft.XMLHTTP'];
		for(var n = 0; n < MSXML.length; n ++)
		{
			try
			{
				var objXMLHttp = new ActiveXObject(MSXML[n]);
				break;
			}
			catch(e)
			{
			}
		}
	} 

	// mozilla某些版本没有readyState属性
	if (objXMLHttp.readyState == null)
	{
		objXMLHttp.readyState = 0;

		objXMLHttp.addEventListener("load", function ()
		{
			objXMLHttp.readyState = 4;

			if (typeof objXMLHttp.onreadystatechange == "function")
			{
				objXMLHttp.onreadystatechange();
			}
		}, false);
	}

	return objXMLHttp;
},

// 发送请求(方法[post,get], 地址, 数据, 回调函数)
sendReq: function (method, url, data, callback)
{
	var objXMLHttp = this._getInstance();

	with(objXMLHttp)
	{
		try
		{
			// 加随机数防止缓存
			if (url.indexOf("?") > 0)
			{
				url += "&randnum=" + Math.random();
			}
			else
			{
				url += "?randnum=" + Math.random();
			}

			open(method, url, true);

			// 设定请求编码方式
			setRequestHeader('Content-Type', 'application/x-www-form-urlencoded; charset=UTF-8');
			send(data);
			onreadystatechange = function ()
			{
				if (objXMLHttp.readyState == 4 && (objXMLHttp.status == 200 || objXMLHttp.status == 304))
				{
					//callback(objXMLHttp, url);
					if(document.getElementById(callback)) document.getElementById(callback).innerHTML = objXMLHttp.responseText; //后修改过的上句为原句
				}
			}
		}
		catch(e)
		{
			alert(e);
		}
	}
}
}; 


//function callbackXMLHttp(obj, url)
//{
//	if(document.getElementById(containerid))
//		document.getElementById(containerid).innerHTML = obj.responseText;
//}

var loadstatustext="<div style='z-index:10; position:absolute; width:500px; height:25px'><img src=/images/loading.gif>&nbsp;&nbsp;正在获取信息…………</div>";
var defaultcontentarray=new Object();
var urlgetcontent = new Array();  //保存已调过的数据

//url取值地址，containerid装载值的容器,isRefresh是否刷新时重新加载
function ajaxpage(url, containerid, isRefresh)
{
	document.getElementById(containerid).innerHTML=loadstatustext + document.getElementById(containerid).innerHTML;
	if(!isRefresh)
	{
		if(urlgetcontent[url])
		{
			document.getElementById(containerid).innerHTML=urlgetcontent[url];
			return;
		}
	}
	XMLHttp.sendReq('GET', url, '', containerid);
	//urlgetcontent[url] = document.getElementById(containerid).innerHTML;
	//alert(document.getElementById(containerid).innerHTML);
	if(!isRefresh)	setTimeout("saveurlgetcontent('"+url+"','"+containerid+"')",500);
}

function saveurlgetcontent(url,containerid)
{
	urlgetcontent[url] = document.getElementById(containerid).innerHTML;
}


function startajaxtabs()
{
	var eventlist=document.getElementsByTagName("a"); //array containing the LI elements within UL
	for (var x=0; x<eventlist.length; x++)
	{ //loop through each LI element
		var eventlistlink=eventlist[x];
		if (eventlistlink.getAttribute("rel"))
		{
			eventlistlink.onclick=function()
			{
				ajaxpage(this.getAttribute("href"), this.getAttribute("rel"),false);
				return false;
			}
		}
	}
}