function create_obj(){
    var http_request = false;

    //开始初始化XMLHttpRequest对象
    if(window.XMLHttpRequest) { //Mozilla 浏览器
        http_request = new XMLHttpRequest();
        if (http_request.overrideMimeType) {//设置MiME类别
            http_request.overrideMimeType("text/xml");
        }
    }
    else if (window.ActiveXObject) { // IE浏览器
        try {
            http_request = new ActiveXObject("Msxml2.XMLHTTP");
        } catch (e) {
            try {
                http_request = new ActiveXObject("Microsoft.XMLHTTP");
            } catch (e) {}
        }
    }

    if (!http_request) { // 异常，创建对象实例失败
        return false;
    }

    return http_request;
}


function send_request(http_request,url,postStr) {
    http_request.open("POST", url, true);
    http_request.setRequestHeader("Content-Type","application/x-www-form-urlencoded"); 
    http_request.send(postStr);
}


function openwin(){
	var http_request = create_obj();

	http_request.onreadystatechange = function(){
		if (http_request.readyState == 4 && http_request.status == 200) { 
	        //alert(http_request.responseText);
			if(0==http_request.responseText){
				window.open('http://mv.zol.com.cn/topic.html','','left=0,top=0,location=yes,menubar=yes,resizable=yes,scrollbars=yes,status=yes,toolbar=yes,title=yes,FullScreen=yes');
			}
		}
	}
	send_request(http_request,"/yule_topic/checkIpShowWindow.php","");
}
//setTimeout("openwin()",20000);

//openwin();