//milanv

		var answerbox = "";
		var legoid = "";
		var preview = "";

		var currentpart = "";

		function el_initvars()
		{
			legoid = document.getElementById("partlegoid");
			preview = document.getElementById("partpreview");
			answerbox = document.evaluate("//div[contains(concat(' ', normalize-space(@class), ' '), ' sceditor-container ')]//textarea", document, null, XPathResult.FIRST_ORDERED_NODE_TYPE, null).singleNodeValue;
		}

		function insertAtCursor(myField, myValue)
		{
                    //IE support
                    if (document.selection) {
			myField.focus();
			sel = document.selection.createRange();
			sel.text = myValue;
                    }
                    //MOZILLA and others
                    else if (myField.selectionStart || myField.selectionStart == '0') {
			var startPos = myField.selectionStart;
			var endPos = myField.selectionEnd;
			myField.value = myField.value.substring(0, startPos)
                            + myValue
                            + myField.value.substring(endPos, myField.value.length);
			myField.selectionStart = startPos + myValue.length;
			myField.selectionEnd = startPos + myValue.length;
                    } else {
			myField.value += myValue;
                    }
		}

		function normalize_number(num)
		{
			var n = Number(num);
			if (isNaN(n) ) { return null; }
			if (n < 1 || n > 1e10) { return null ; }
			return String(n);
		}

		var getJSON = function(url, callback) {
			var xhr = new XMLHttpRequest();
			xhr.open('GET', url, true);
			xhr.responseType = 'json; charset=utf-8';
			xhr.onload = function() {
				var status = xhr.status;
				if (status === 200) {
					callback(null, xhr.responseText);
				} else {
					callback(status, xhr.responseText);
				}
			};
			xhr.send();
		};


		function loadpart() {
			el_initvars();
			var buttons = "<button type=\"button\" onclick=\"cancelpart();\">Cancel</button><button type=\"button\" onclick=\"submitpart();\">OK</button>";

			var testid = normalize_number(legoid.value);
			if (!testid) { alert("Chybné číslo (" + legoid.value + ")" ) ; return; }

			getJSON("/spolek/rebrickable/pxy_el.php?id=" + testid, function(err, data) {
				if (err != null) {
					errormessage = "<span style=\"color: red\">Chyba při hledání dílu.</span>";
					switch (err) {
						case 400:
							errormessage += "<br>chybný požadavek";
							break;
						case 401:
							errormessage += "<br>neoprávněný přístup";
							break;
						case 403:
							errormessage += "<br>nemáte oprávnění k této operaci";
							break;
						case 404:
							errormessage += "<br>díl nenalezen";
							break;
						case 429:
							errormessage += "<br>server je přetížený, zkuste dotaz opakovat později";
							break;
						default:
							errormessage += "<br>Neznámá chyba, kód chyby: " + String(err);
							break;
					}
					preview.innerHTML = errormessage;
					currentpart = "";
					return;
				}
				var rd = JSON.parse(data);
				var showpart = "<table border=\"1\"><tr><td><img src=\"" + rd.element_img_url + "\" width=80></td><td>" +
					rd.part.name +  "</td><td>" +
					rd.color.name + "</td><td>" +
					rd.part.part_num + "</td><td>" +
					"<b>" + rd.element_id + "</b></td><td>" +
					"<a href=\"https://www.bricklink.com/v2/search.page?q=" + rd.element_id + "\">Bricklink</a></td>" +
					"</tr></table>" + buttons;
				currentpart = "[tr][td][img width=80]" + rd.element_img_url + "[/img][/td][td]" +
					rd.part.name +  "[/td][td]" +
					rd.color.name + "[/td][td]" +
					rd.part.part_num + "[/td][td]" +
					"[b]" + rd.element_id + "[/b][/td][td]" +
					"[url=https://www.bricklink.com/v2/search.page?q=" + rd.element_id + "]Bricklink[/url][/td]" +
					"[/tr]\n";
				preview.innerHTML = showpart;
			});
		}

		function set_status(text) {
			el_initvars();
			preview.innerHTML = text;
			legoid.value="";
		}

		function cancelpart() {
			el_initvars();
			preview.innerHTML = "";
			currentpart = "";
			set_status("");
		}

		function submitpart() {
			el_initvars();
			if (currentpart == "") { return ; }
			if (answerbox == null) {
				set_status("<b>Vlož do příspěvku: </b>" + currentpart);
			} else {
				insertAtCursor(answerbox,currentpart);
				set_status("Díl přidán, můžeš zadat další.");
			}
		}