function displaynull() {
	document.getElementById("vname").innerHTML = "<TABLE cellSpacing=0 cellPadding=0 width='100%' border=0><TBODY>" + "<TR>" + "<TD class=font12b align=middle width=75 " + " background=../img/9_34.jpg height=24>\u6307\u6570\u540d\u79f0</TD>" + " <TD class=font12b align=middle width=75 " + " background=../img/9_34.jpg>\u6700\u65b0</TD>" + " <TD class=font12b align=middle width=75" + " background=../img/9_34.jpg>\u6da8\u8dcc</TD>" + " <TR>" + "<TR>" + "\t<TD class=font12 align='center' colspan=5 >\u65e0\u6570\u636e</TD>" + "</TR>" + " </TBODY>" + "</TABLE>";
}
	//初始化http_request对象
function CreateXmlHttp() {

	var http = null;
	
	if (window.XMLHttpRequest) { //Mozilla 浏览器
		http = new XMLHttpRequest();
	} else {
		if (window.ActiveXObject) { // IE浏览器
			try {
				http = new ActiveXObject("MSXML2.XMLHTTP");
			}
			catch (e) {
				try {
					http = new ActiveXObject("Microsoft.XMLHTTP");
				}
				catch (e) {
				}
			}
		}
	}
	return http;
}

//创建http_request对象，指定返回函数，打开连接
function getHeader(code, urlr) {
	httpers = CreateXmlHttp();
	
	httpers.onreadystatechange = handleStateChange;
	
	httpers.open("POST", urlr + "?code=" + code, true);
	
	httpers.send(null);
}	

//返回函数，对返回的内容进行处理
function handleStateChange() {
	if (httpers.readyState == 4) {
		if (httpers.status == 200) {
		//返回文本信息	
			var str = httpers.responseText;
			//alert(str);
			//判断是否为空文本
			if (str == "" || str == null) {
				displaynull();
				return;
			}
				//执行主方法填充标签
			document.getElementById("vcode").innerHTML=str;
		} else {
			document.getElementById("vcode").innerHTML = "loading.";
		}
	}
}