function createXmlHttpRequestObject() 
{
  var xmlHttp;
  try
  {
    xmlHttp = new XMLHttpRequest();
  }
  catch(e)
  {
    var XmlHttpVersions = new Array("MSXML2.XMLHTTP.6.0",
                                    "MSXML2.XMLHTTP.5.0",
                                    "MSXML2.XMLHTTP.4.0",
                                    "MSXML2.XMLHTTP.3.0",
                                    "MSXML2.XMLHTTP",
                                    "Microsoft.XMLHTTP");
    for (var i=0; i<XmlHttpVersions.length && !xmlHttp; i++) 
    {
      try 
      {
        xmlHttp = new ActiveXObject(XmlHttpVersions[i]);
      } 
      catch (e) {}
    }
  }
  if (!xmlHttp)
    alert("Error creating the XMLHttpRequest object.");
  else 
    return xmlHttp;
}


function processajax (serverPage, obj, getOrPost, str)
{
	var xmlhttp = createXmlHttpRequestObject();
	if (getOrPost == "post") 
	{
		xmlhttp.open("POST", serverPage, true);
		xmlhttp.setRequestHeader("Content-Type","application/x-www-form-urlencoded; charset=UTF-8");
		xmlhttp.onreadystatechange = function() 
		{
			if (xmlhttp.readyState == 4 && xmlhttp.status == 200) 
			{
				if (obj) document.getElementById(obj).innerHTML = xmlhttp.responseText;
			}
		}
		xmlhttp.send(str+'r='+Math.random());
	}
	else
	{
		xmlhttp.open("GET", serverPage+'&r='+Math.random());
		xmlhttp.onreadystatechange = function() 
		{
			if (xmlhttp.readyState == 4 && xmlhttp.status == 200) 
			{
				if (obj) document.getElementById(obj).innerHTML = xmlhttp.responseText;
			}
		}
		xmlhttp.send(null);
	}
}


function counter(id, ev)
{
	processajax('counter.php?id='+id+'&event='+ev+'&mr='+Math.random());
}