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("Your browser does not support AJAX!");

      return false;

      }

    }

  }

  }