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    var xmlhttp= false; 
    try {
    xmlhttp = new XMLHttpRequest();
  } catch (trymicrosoft) {
    try {
      xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
    } catch (othermicrosoft) {
      try {
        xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
      } catch (failed) {
        xmlhttp = false;
      } 
    }
  }

  if (!xmlhttp)
    alert("³õʼ»¯ XMLHttpRequest ʱ³ö´í!");

    xmlhttp.onreadystatechange=function(){ 
    if (xmlhttp.readyState==4){ 
        if (xmlhttp.status==200){ 
            var data=xmlhttp.responseText;&nbs


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