function ajax(href,div,querystring,page,LoadingMessage)
  {
  var xmlHttp;
  try
    {
	xmlHttp=new XMLHttpRequest();}
  catch (e)
    {
	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;        }      }    }
    xmlHttp.onreadystatechange=function()
      {
      if(xmlHttp.readyState==1)
        {
        document.getElementById(div).innerHTML=LoadingMessage;
        }
        else if(xmlHttp.readyState==4)
        {
        document.getElementById(div).innerHTML=xmlHttp.responseText;
        }
      }
 	var url="";
	url=href+querystring+page;
    xmlHttp.open("GET",url);
    xmlHttp.send(null);
	}