function GetXmlHttpObject()
{
	var xmlHttp=null;
	try
	{
		xmlHttp=new XMLHttpRequest();
		if (xmlHttp.overrideMimeType)
		{
			xmlHttp.overrideMimeType('text/xml');
		}
	}
	catch (e)
	{
		try
		{
			xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
		}
		catch (e)
		{
			xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
		}
	}
	return xmlHttp;
}

//**************************
function ajax_rndimg(s)
{
	var xmlHttp;
	xmlHttp = GetXmlHttpObject();
	if(xmlHttp!=null)
    	{
		xmlHttp.onreadystatechange=function(s)
    		{
			if (xmlHttp.readyState == 4)
			{
				if(xmlHttp.status  == 200)
				{
				 	document.getElementById('rnd_banner').innerHTML=xmlHttp.responseText;
				 	//return true;
				}
				 else
				{
					alert('Hiba történt a kérés kiszolgálása során.');
					//return false;
                 		}
			}
    		}
		xmlHttp.open("post","rndimages.php",true);
		xmlHttp.setRequestHeader('Content-Type','application/x-www-form-urlencoded; charset=iso-8859-2');
		var post_req="kep_dir=" + encodeURIComponent(s);
		xmlHttp.send(post_req);
		//return true;
	}
	else
	{
		alert('No AJAX-support!/nPlease use FireFox, Opera or Internet Explorer.');
		//return false;
	}
}