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<?php
header("content-type: text/html;charset=gb2312");
?>
<script type="text/javascript" src="re.js"></script>
<form action="#" id='form1'>
Óû§Ãû:<input type="text" id="UserName" onblur="ck_name();">
<div id="regname"></div>
</form>


jsÄÚÈÝ

var xmlHttp=false;
try {
  xmlHttp=new xmlHttpRequest();
}
catch (e) {
  try {
  xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
  }
  catch (e) {
  try {
  xmlHttp=new ActiveXObject("Mircosoft.XMLHTTP");
  }
  catch (e) {
  xmlHttp=false;
  }
  }
}
if (!xmlHttp) {
  alert("ÎÞ·¨´´½¨XMLHttpRequest¶ÔÏó£¡");
}
function Trim(strSource){
  return strSource.replace(/^\s*/,'').replace(/\s*$/,'');
}

function ck_name() {
  var obj=Trim(document.getElementById("UserName").value);
  var re=/^[\da-zA-Z]+$/;
var txt=document.getElementById("


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