function get_data() 
{
	var http_request = false;
	var inputs;
	inputs = document.getElementById('obvod_div_id').getElementsByTagName('input');
	
	var c_value = new Array()
	
	for (var i=0; i < inputs.length; i++)
	{
		if ( inputs[i].checked )
		{
			c_value[i] = inputs[i].value;
		}
	}

	var request = "id_obvod="+c_value;

	if (window.XMLHttpRequest) 
	{
		http_request = new XMLHttpRequest();
	}
	
	else if (window.ActiveXObject) 
	{
		try
		{
		  http_request = new ActiveXObject("Msxml2.XMLHTTP");
		}
		catch (eror) 
		{
		  http_request = new ActiveXObject("Microsoft.XMLHTTP");
		}
	}

	http_request.onreadystatechange = function() { parse(http_request); };
	http_request.open('POST', 'ajax/ajax.Obvod.php', true);
	http_request.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
	http_request.send(request);
}

function parse(http_request)
{
	if (http_request.readyState == 4)
	{
		if (http_request.status == 200) 
		{
			document.getElementById("boxfield2").innerHTML = http_request.responseText;
		} 	
		else 
		{
			alert('Chyba');
		}
	}
}