function ADsystemAdvertCounter(idadvert){
  try{    // Firefox, Opera 8.0+, Safari    
    xmlHttp=new XMLHttpRequest();    
  }
  catch (e){    // Internet Explorer    
    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(){}
  var address = "/ADS/ADsystemAdvertCounter.php?action=addCounter&id="+idadvert;
  xmlHttp.open("GET",address,true);
  xmlHttp.send(null);
}