function createXMLHttpRequest(){
	var xmlhttp = null;
	try {
		xmlhttp = window.XMLHttpRequest ? new XMLHttpRequest() : new ActiveXObject("Microsoft.XMLHTTP");
	} catch (e) {
		alert("Vaš pretraživač ne podržava XMLHttpRequest!");
	}
	return xmlhttp;
}
var xhr = createXMLHttpRequest();
function karma(id, action){
	xhr.open('get', '/controls/obradikarmu.php?id='+ id +'&action='+ action);
	xhr.onreadystatechange = handleResponse;
	xhr.send(null);
}
function handleResponse(){
	if(xhr.readyState == 4){
		var response = xhr.responseText.split('|');
		if(response[0] == 'done'){
			if(response[1]){
				document.getElementById("down-"+response[1]).src        = '/repository/images/jesivideo/thumb-dn-gray.png';
				document.getElementById("down-"+response[1]).onclick    = '';
				document.getElementById("up-"+response[1]).src          = '/repository/images/jesivideo/thumb-up-gray.png';
				document.getElementById("up-"+response[1]).onclick      = '';
				if(response[2] > 0) {
					var karmanumber = '+' + response[2];
				} else {
					var karmanumber = response[2];
				}
				document.getElementById("karma-"+response[1]).innerHTML = karmanumber;
			}
		} else if(response[0] == 'error'){
			var error = 'Error: '+response[1];
			alert(error);
		} else {
			var resp = 'Odgovor: '+response[0]; 
			alert(resp);
		}
	}
}