var timeout_reload = 30; // Seconds
var url_load = "/banner/";
var id_banner_block="banner_block";

function LoadBanner(){
	setInterval( "loadXMLDoc(url_load,id_banner_block)" , timeout_reload*1000 );
}

function RealyDelay(mSec)
{
   var
     start=new Date(),
     stop;

   do
   {
      stop=new Date();
   }while(stop.getTime()-start.getTime()<mSec);
}

function loadXMLDoc(url,id)
{
    req = null;
    if (window.XMLHttpRequest) {
        try {
            req = new XMLHttpRequest();
        } catch (e){}
    } else if (window.ActiveXObject) {
        try {
            req = new ActiveXObject('Msxml2.XMLHTTP');
        } catch (e){
            try {
                req = new ActiveXObject('Microsoft.XMLHTTP');
            } catch (e){}
        }
    }
 
    if (req) {       
        req.open("GET", url, true);
        req.setRequestHeader("If-Modified-Since", "Sat, 1 Jan 2000 00:00:00 GMT");
        req.onreadystatechange = processReqChange;
        req.send(null);
    }
}
 
function processReqChange()
{
  try {
    if (req.readyState == 4) {
        // для статуса "OK"
        if (req.status == 200) {
        	document.getElementById(id_banner_block).innerHTML=req.responseText;
        	//alert(req.responseText);
        } 
    }
  }
  catch( e ) {
  }
}

LoadBanner();