function getObj(name) {
	if (document.getElementById) {
		this.obj = document.getElementById(name);
	}
	else if (document.all) {
		this.obj = document.all[name];
	}
	else if (document.layers) {
		this.obj = document.layers[name];
	}
}


function howUseful(vote, id) {
	var oX = zXmlHttp.createRequest();
	oX.open("get", "/ur/useful.php?id=" + id + "&vote=" + vote, true);
	oX.onreadystatechange = function() {
		if (oX.readyState == 4) {
			change(oX.responseText);
		}
	};
	oX.send(null);
}

function change(response) {
	if(response != 0) {
		var ptext = document.getElementById("useful");
		ptext.innerHTML = response;
	}
}