function InitAjax() {
	var http_request = false;
	if (window.XMLHttpRequest) {
		http_request = new XMLHttpRequest();
		if (http_request.overrideMimeType)
			http_request.overrideMimeType("text/xml");
	} else if (window.ActiveXObject) {
		try {
			http_request = new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e) {
			try {
				http_request = new ActiveXObject("Microsoft.XMLHTTP");
			} catch (e) {
			}
		}
	}
	if (!http_request) {
		return false;
	}
	return http_request;
}
function get_msg(url,type,result){
	
	var ajax = InitAjax();
	ajax.open(type,url,true);
	ajax.send(null);
	ajax.onreadystatechange = function()
	{
		if(ajax.readyState == 4 && ajax.status == 200)
		{
			result(ajax);
		}
	}
}
function get_post(url,type,result,str){
	
	var ajax = InitAjax();
	ajax.open(type,url,true);
	ajax.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
	ajax.send(str);
	ajax.onreadystatechange = function()
	{
		if(ajax.readyState == 4 && ajax.status == 200)
		{
			result(ajax);
		}
	}
}