var xmlHttp

function trim(param) 
{ 
	return param.replace(/^\s+|\s+$/g,""); 
}

function set_counter(param_url)
{
  //document.getElementById("table_value").innerHTML="Loading...";
  xmlHttp=GetXmlHttpObject()

  if (xmlHttp==null)
    {
    alert ("No AJAX");
    return;
    }	
   if (trim(param_url)=="")
   {
       alert("data is not valid.");
	   return false;
   }

  var url=param_url;   
  xmlHttp.onreadystatechange=function()
  {     
  	if (xmlHttp.readyState==4)
	  {// 4 = "loaded"
	  	  if (xmlHttp.status!=200)			
		  {
			 alert("Problem retrieving data:" + xmlhttp.statusText);
		  }
	  } 
  }
  xmlHttp.open("GET",url,true);
  xmlHttp.setRequestHeader("If-Modified-Since","0");	
  xmlHttp.send(null); 
} 

function GetXmlHttpObject()
{
  var xmlHttp=null;
  try
    {
    // Firefox, Opera 8.0+, Safari
    xmlHttp=new XMLHttpRequest();
    }
  catch (e)
    {
    // Internet Explorer

    try
      {
      xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
      }
    catch (e)
      {
      xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
      }
    }
return xmlHttp;
}