function GetXmlHttpObject( handler ) {
  var objXmlHttp = null;

  if (navigator.userAgent.indexOf("MSIE") >= 0) 
  {
    var strName = "Msxml2.XMLHTTP"
    if (navigator.appVersion.indexOf("MSIE 5.5") >= 0) 
	{
      strName = "Microsoft.XMLHTTP";
    }

    try 
    {
      objXmlHttp = new ActiveXObject(strName)
      objXmlHttp.onreadystatechange = handler;
      return objXmlHttp;
    } catch(e) {
      alert("Error. Scripting for ActiveX might be disabled");
      return;
    }
  } 
  if (navigator.userAgent.indexOf("Mozilla") >= 0 ) 
  {
    objXmlHttp = new XMLHttpRequest();
    objXmlHttp.onload = handler;
    objXmlHttp.onerror = handler;
    return objXmlHttp;
  }
}

function xajax_onstateChange()
{
  if(req.readyState == 4)
  {
    if(req.status == 200)
    {


      //create new request object
	  req = GetXmlHttpObject( xajax_onstateChange );	
	}
  }
  
}

var req = GetXmlHttpObject( xajax_onstateChange );
var update_div = "";
var onUpdate;

function getContent(url)
{

  req.open( "GET", url, true );

  req.setRequestHeader("Content-Type", "application/x-www-form-urlencoded" );  

  req.send(null);

}