// JavaScript Document
function checkuser()
{
var bb=document.getElementById ("aa");
var user="aa="+bb.value;
var xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
var xmldoc = new ActiveXObject("Msxml.DOMDocument");
xmlhttp.Open("POST","checkuser.asp",false);
xmlhttp.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
xmlhttp.Send(user);
xmlhttp.onreadystatechange=function() {
if (xmlhttp.readyState==4) {
alert(xmlhttp.responseText)
}
}
if(xmlhttp.status!=200)
alert ('网络故障(xmlhttp.status='+xmlhttp.status+')，请稍后再试！');
var aaaa = xmlhttp.responseText;
document.getElementById("name_show").innerHTML = aaaa;
}