<script type="text/javascript">

 function ajaxFunction()

 { var xmlHttp;

 try { // Firefox, Opera 8.0+, Safari

 xmlHttp=new XMLHttpRequest();

  }

 catch (e)

 { // Internet Explorer

 try {

 xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");

  }

 catch (e) {

 try {

 xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");

 } catch (e) {

 alert("您的浏览器不支持AJAX！");

 return false;

 }

 }

 }

 }

 </script>