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a.asp
------------------------------------------------<SCRIPT language=javascript src="check.js"></SCRIPT>
<input type="button" value="²âÊÔ" onclick="test(0);">
<span id="cc"></span>


check.js
------------------------------------------------
  function test(str)
  {
  var xmlhttp=createxmlhttprequest();
  xmlhttp.open('get',encodeURI('Check.asp?cj_id='+str+'&'+new Date().getTime()),false);
  xmlhttp.onreadystatechange=function()
  {
  if(xmlhttp.readyState==4)
  {
   
  if(xmlhttp.status==200)
  {
  var pnum=xmlhttp.responseText; 
  document.getElementById("cc").innerHTML=pnum;
  }
  }
  }
  xmlhttp.send(null);
  }

check.asp
------------------------------------------------
<SCRIPT LANGUAGE="JavaScript">
function ck()
{
  if (document.theform.bang.value=="")
  {
  alert("³ö´íÀ²£¡");
  document.theform.bang.focus()
  return false;
  }
return true;<


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