var http_request = false;
	var obj;
	function send_request(url) {
		http_request = false;
		if(window.XMLHttpRequest) { //Mozilla 
			http_request = new XMLHttpRequest();
			if (http_request.overrideMimeType) {
				http_request.overrideMimeType('text/xml');
			}
		}
		else if (window.ActiveXObject) { // IE
			try {
				http_request = new ActiveXObject("Msxml2.XMLHTTP");
			} catch (e) {
				try {
					http_request = new ActiveXObject("Microsoft.XMLHTTP");
				} catch (e) {}
			}
		}
		if (!http_request) { 
			window.alert("连接信息错误。");
			return false;
		}
		http_request.onreadystatechange = processRequest;		
		http_request.open("get", url, true);
		http_request.setRequestHeader("Content-Type","application/x-www-form-urlencoded");	
		http_request.send(null);
	}
	
function processRequest() {
	if (http_request.readyState == 4) { 
		if (http_request.status == 200) { 
			getObj(obj).innerHTML=http_request.responseText;
		} else { 
			alert("载入信息错误。");
		}
	}
}
function initAjax() {
	var ajax=false;
	try {
		ajax = new ActiveXObject("Msxml2.XMLHTTP");
	} catch (e) {
		try {
			ajax = new ActiveXObject("Microsoft.XMLHTTP");
		} catch (E) {
			ajax = false;
		}
	}
	if (!ajax && typeof XMLHttpRequest!='undefined') {
		ajax = new XMLHttpRequest();
	}
	return ajax;
}
function getObj(objId) {	return document.all ? document.all[objId] : document.getElementById(objId);}
function hideIt(obj) {	getObj(obj).style.display = "none";}
function showIt(obj) {	getObj(obj).style.display = "block";}
function $(objId) {	return document.all ? document.all[objId] : document.getElementById(objId);}