document.charset="gb2312"
//检测用户名
function checkuser(){
 if(document.RegForm.shopname.value == ""){       
  alert("请输入用户名！");
  document.RegForm.shopname.focus();
 }else{
  var uname = document.RegForm.shopname.value;
  sendRequest('test1_chk.asp?uname='+ uname);
 }
}
//发送请求函数
function sendRequest(url) {
 createXMLHttpRequest();
 XMLHttpReq.open("GET", url, true);
 XMLHttpReq.onreadystatechange = processResponse;
 XMLHttpReq.send(null);
}
var XMLHttpReq;
//创建XMLHttpRequest对象       
function createXMLHttpRequest() {
 XMLHttpReq = false; 
 if (window.XMLHttpRequest) {
  XMLHttpReq = new XMLHttpRequest(); 
  if (XMLHttpReq.overrideMimeType) {
   XMLHttpReq.overrideMimeType("text/xml"); 
  } 
 } else if (window.ActiveXObject) {
  try { 
   XMLHttpReq = new ActiveXObject("Msxml2.XMLHTTP"); 
  } catch (e) { 
   try { 
    XMLHttpReq = new ActiveXObject("Microsoft.XMLHTTP"); 
    XMLHttpReq.overrideMimeType('text/xml'); 
   } catch (e) { 
    document.write("对不起，你的浏览器不支持ajax！"); 
   } 
  } 
 } 
 if (!XMLHttpReq) { 
  alert('Giving up :( Cannot create an XMLHTTP instance'); 
  return false; 
 } 
 return XMLHttpReq;
}
// 处理返回信息函数
function processResponse() {
 if (XMLHttpReq.readyState == 4) {
  if (XMLHttpReq.status == 200) {
   var result=""+XMLHttpReq.responseText;
            //window.alert(result);  
			var ch;
			ch=document.getElementById("check1");
			ch.innerHTML="<font color='#666666'>"+result+"</font>";              
  } else {
   window.alert("您所请求的页面有异常。");
  }
 }
}