// request
function sendRequest(url, params, callbackMethod)
{
	request = createRequestObject();
	request.open("POST", url, true);

	if (callbackMethod != null)
		request.onreadystatechange = callbackMethod;
	request.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded; charset=utf-8');
	if (params != null)
	{
		request.setRequestHeader('Content-Length', params.length);
        request.send(params);
	}
	else
        request.send(null);
}


function createRequestObject()
{
	if(window.XMLHttpRequest)
		obj = new XMLHttpRequest();
	else if(window.ActiveXObject)
	{
		try 
		{
			obj = new ActiveXObject("Msxml2.XMLHTTP")
		} 
		catch (e)
		{
			try
			{
				obj = new ActiveXObject("Microsoft.XMLHTTP")
			}
			catch (e){}
		}
	}
	
	return obj;
}

function checkReadyState(obj)
{
	if (document.getElementById('loading') != null)
	{
		document.getElementById('loading').style.display = '';
		
		if(obj.readyState == 0) { document.getElementById('loading').innerHTML = "Töltés..."; }
		if(obj.readyState == 1) { document.getElementById('loading').innerHTML = "Töltés..."; }
		if(obj.readyState == 2) { document.getElementById('loading').innerHTML = "Töltés..."; }
		if(obj.readyState == 3) { document.getElementById('loading').innerHTML = "Töltés..."; }
		if(obj.readyState == 4)
		{
			if(obj.status == 200)
			{
				document.getElementById('loading').innerHTML = "";
				document.getElementById('loading').style.display = 'none';
				return true;
			}
			else
			{
				document.getElementById('loading').innerHTML = "HTTP " + obj.status;
				alert("Hiba: "+obj.status);
				return false;
			}
		}
	}
	else
	{
		if (obj.readyState == 4)
			return obj.status == 200;
	}
}