var http_request = false;
function makeRequest(url, parameters, kam) {
	http_request = false;
	if (window.XMLHttpRequest) {
		http_request = new XMLHttpRequest();
		if (http_request.overrideMimeType) {
			http_request.overrideMimeType('text/html');
		}
	} else if (window.ActiveXObject) {
		try {
			http_request = new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e) {
			try {
				http_request = new ActiveXObject("Microsoft.XMLHTTP");
			} catch (e) {}
			}
	}
	
	if (!http_request) {
		alert('Nemôžem vytvoriť XMLHTTP instanciu');
		return false;
	}

	http_request.onreadystatechange = function () 
    {
        alertContents(kam) 
    };
	http_request.open('GET', url + parameters, true);
	http_request.send(null);
}


function alertContents(kam) {
    if (http_request.readyState == 4)
    {
        if (( http_request.status >= 200 && http_request.status < 300 ) || http_request.status == 304)
        {
            if (typeof kam == 'string') 
            {	
            	document.getElementById('infobox').style.visibility = 'hidden';
                document.getElementById(kam).innerHTML = http_request.responseText;
            }
            if (typeof kam == 'function') 
            {
                kam(http_request.responseText);
            }
        }
        else
        {
            document.getElementById('infobox').innerHTML = '<br /><br />Chyba pri načítaní stránky ' + http_request.status +' : '+ http_request.statusText;
        }
    }
    else
    {
        if (typeof kam == 'string' && kam != '') 
        {
            document.getElementById('infobox').innerHTML = '<img src="http://www.mgphoto.sk/sablony/images/loading.gif" width="16" height="16" alt="" title="" /><br />Náhrávam obrázky...';
            document.getElementById('infobox').style.visibility = 'visible';
        }
    }
       
}