function goAjax()
{
var req = false;
try
  {
    req = new XMLHttpRequest(); /* e.g. Firefox */
  }
catch(err1)
  {
  try
    {
     req = new ActiveXObject("Msxml2.XMLHTTP");
  /* some versions IE */
    }
  catch(err2)
    {
    try
      {
       req = new ActiveXObject("Microsoft.XMLHTTP");
  /* some versions IE */
      }
      catch(err3)
        {
         req = false;
        }
    }
  }
return req;
}
window.onload = function(){
var i = setInterval(schimbare_bannere,3000);
}
function schimbare_bannere(){	
		schimba_banner('a1','1','1');
		schimba_banner('b2','1','3');
		schimba_banner('z','1','5');
		schimba_banner('c1','1','6');
		schimba_banner('d1','0','0');
		schimba_banner('d2','0','0');
   }
function schimba_banner(zona,pagina,csp){
	var banner = goAjax();
	var id_unic = Math.random()*10000000;
	var url="get_banners_comm.php?zona="+zona+"&pagina="+pagina+"&comm_sp_id="+csp+"&id_u="+id_unic;
	banner.open("GET",url,true);
	banner.onreadystatechange = function(){
		if(banner.readyState == 4){
			document.getElementById(zona).innerHTML="<img src='logo_sp/"+banner.responseText+"'>";
		}
	}
	banner.send(null);
}