<script language="javascript">

function Inint_AJAX() 
{  
  try { return new ActiveXObject("Msxml2.XMLHTTP");    } catch(e) {} //IE
  try { return new ActiveXObject("Microsoft.XMLHTTP"); } catch(e) {} //IE
  try { return new XMLHttpRequest();                   } catch(e) {} //Native Javascript
  
  alert("XMLHttpRequest not supported");
  return null;
}

function request(url) 
{
    var ajax = Inint_AJAX();    
    
    ajax.onreadystatechange = function ()
    {
      if ((ajax.readyState == 4) && (ajax.status == 200))
      {
        var text = ajax.responseText.toString();
        
        document.getElementById('incl').innerHTML = text;
      }
    };
    
    ajax.open('GET', url);    
    ajax.send(null);

}
</script>

<input type="button" onClick="javascript:request('http://localhost/');" value="Press">
<div id="incl"></div>