if(window.XMLHttpRequest){//IE
ajax=new XMLHttpRequest();
}
else if(window.ActiveXObject)
{
ajax=new ActiveXObject("Microsoft.XMLHTTP");
}

function loading(divnamestr){
errhtml="加载失败，请重新再试"
okhtml="数据正在处理中"
if(ajax.readyState==4){
       if(ajax.status==200) {
     document.getElementById(""+divnamestr+"").innerHTML=okhtml;
     }else{
     document.getElementById(""+divnamestr+"").innerHTML=errhtml;
     return false;
    }
}
}

function checkPiao(username,nmb){
   var strurl="piao="+username;
   ajax.open("POST","checkPiao.asp",false);
   ajax.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
   ajax.send (strurl);//提交发送
   ajax.onreadystatechange=function(){loading("txtPiao"+nmb);}// 处理返回信息的函数
   document.getElementById("txtPiao"+nmb).innerHTML=unescape(ajax.responseText);//返回ASP执行回的信息

}